Adverse perinatal outcomes for advanced maternal age: a cross-sectional study of Brazilian births

Adverse maternal outcomes and associated factors among mothers of advanced age delivering at a tertiary hospital, southwestern Uganda: a cross-sectional study

BACKGROUND

Mothers of advanced age, defined as pregnant women aged ≥ 35 years at the time of giving birth, are traditionally known to be associated with increased risks of adverse maternal outcomes. We determined the prevalence of adverse maternal outcomes and associated factors among mothers of advanced age who delivered at Kabale Regional Referral Hospital (KRRH), in Southwestern Uganda.

METHODS

We conducted a cross-sectional study at the Maternity Ward of KRRH from April to September 2023. We consecutively enrolled pregnant women aged ≥ 35 years during their immediate post-delivery period and before discharge. We obtained data on their socio-demographic, obstetric, medical characteristics and their maternal outcomes using interviewer-administered questionnaires. We defined adverse maternal outcome as any complication sustained by the mother that was related to pregnancy, delivery and immediate post-partum events (obstructed labour, antepartum haemorrhage, mode of delivery [cesarean or vacuum extraction], postpartum haemorrhage, hypertensive disorders of pregnancy, preterm or postdate pregnancy, anemia, premature rupture of membranes, multiple pregnancy, and maternal death). A participant was considered to have an adverse outcome if they experienced any one of these complications. We identified factors associated with adverse outcomes using modified Poisson regression.

RESULTS

Out of 417 participants, most were aged 35-37 years (n = 206; 49.4%), and had parity ≥ 5 (65.5%). The prevalence of adverse maternal outcomes was 37.6% (n = 157, 95%CI: 33.1-42.4%). Common adverse maternal outcomes included caesarian delivery (23%), and obstructed labour (14.4%). Other complications included anemia in pregnancy (4.5%), chorioamnionitis (4.1%), preterm prelabour rupture of membranes (3.9%), and chronic hypertension and preeclampsia (both 2.4%). Factors associated with adverse maternal outcomes were precipitate labour (adjusted prevalence ratio [aPR] = 1.95, 95%CI: 1.44-2.65), prolonged labour, lasting > 12 h (aPR = 2.86, 95%CI: 1.48-3.16), and chronic hypertension (aPR = 2.01, 95%CI: 1.34-3.9).

CONCLUSION

Approximately two-fifth of the advanced-aged mothers surveyed had adverse outcomes. Mothers with prolonged labour, precipitate labour and chronic hypertension were more likely to experience adverse outcomes. We recommend implementation of targeted interventions, emphasizing proper management of labor as well as close monitoring of hypertensive mothers, and those with precipitate or prolonged labor, to mitigate risks of adverse outcomes within this study population.

Association of maternal, fetal and labor variables with a low Apgar score in the fifth minute in term pregnancy: a case-control study

PURPOSE

To search for maternal, labor-related and fetal variables associated with low Apgar in the fifth minute in term pregnancy.

METHODS

A retrospective case-control study with term births was conducted in a public teaching hospital from 2013 to 2020. Cases were term births with Apgar score less than 7 in the fifth minute, and controls, the next one or two births following a case, with Apgar of 7 or more. Non-cephalic presentations, multiples and malformations were excluded. We accessed 100 cases and 190 controls. We considered significant values of p < 0.05.

RESULTS

Were accessed 27 variables which could be risk factors, from which 12 were associated with the outcome. We found a protective effect of prelabor cesarean for the outcome, odds ratio (OR) 0.38, p = 0.013. Consequently, we conducted two sets of analyses: in the whole group and in the group of laboring women. The values of OR were in general greater in the group of laboring women, compared with the whole group. We conducted multivariate analysis within the group of women in labor. The variables which fitted best in the model were nulliparity, male sex of the fetus, less than six prenatal visits and abnormal cardiotocography; all remained significant. An association of rupture of membranes more than 360 min with the outcome, even after controlling fpr duration of labor, was found; adjusted OR 2.45, p = 0.023.

CONCLUSION

Twelve variables were associated with the outcome. Prelabor cesarean had a protective effect. The time of ruptured membranes was associated with low Apgar.

The interaction between age and parity on adverse pregnancy and neonatal outcomes

Background

Although age and parity are recognized as associated factors for adverse pregnancy outcomes, there are no studies exploring the interaction between the two during pregnancy. This study aimed to investigate the impact of the interaction between age and parity on adverse pregnancy outcomes.

Methods

This was a retrospective cohort study with 15,861 women aged ≥20 years. All women were grouped according to age, parity, and a mix of the two. The data were analyzed using multivariate logistic regression analysis.

Results

Age, parity, and interaction between the two were related with the risk of gestational hypertension, eclampsia/pre-eclampsia, placenta previa, placental implantation, postpartum hemorrhage, preterm birth, cesarean section, and Apgar score <7 within 5 min of birth. The risk of gestational diabetes mellitus and transfer to the neonatal unit was linked with age and the interaction between age and parity, but the impact of parity was not statistically significant. The risk of anemia, placental abruption, premature rupture of the membrane, oligohydramnios, and macrosomia was only associated with parity; the risk of fetal distress was only associated with age.

Conclusion

The interaction between advanced age and parity might results in more adverse outcomes for both puerpera and infants, necessitating additional prenatal screening and health education throughout pregnancy.

Effect of advanced parental age on pregnancy outcome and offspring health

PURPOSE

Fertility at advanced age has become increasingly common, but the aging of parents may adversely affect the maturation of gametes and the development of embryos, and therefore the effects of aging are likely to be transmitted to the next generation. This article reviewed the studies in this field in recent years.

METHODS

We searched the relevant literature in recent years with the keywords of "advanced maternal/paternal age" combined with "adverse pregnancy outcome" or "birth defect" in the PubMed database and classified the effects of parental advanced age on pregnancy outcomes and birth defects. Related studies on the effect of advanced age on birth defects were classified as chromosomal abnormalities, neurological and psychiatric disorders, and other systemic diseases. The effect of assisted reproduction technology (ART) on fertility in advanced age was also discussed.

RESULTS

Differences in the definition of the range of advanced age and other confounding factors among studies were excluded, most studies believed that advanced parental age would affect pregnancy outcomes and birth defects in offspring.

CONCLUSION

To some extent, advanced parental age caused adverse pregnancy outcomes and birth defects. The occurrence of these results was related to the molecular genetic changes caused by aging, such as gene mutations, epigenetic variations, etc. Any etiology of adverse pregnancy outcomes and birth defects related to aging might be more than one. The detrimental effect of advanced age can be corrected to some extent by ART.

The trend in delayed childbearing and its potential consequences on pregnancy outcomes: a single center 9-years retrospective cohort study in Hubei, China

BACKGROUND

Due to the advancement of modern societies, the proportion of women who delay childbearing until or beyond 30 years has dramatically increased in the last three decades and has been linked with adverse maternal-neonatal outcomes.

OBJECTIVE

To determine the trend in delayed childbearing and its negative impact on pregnancy outcomes.

MATERIAL AND METHODS

A tertiary hospital-based retrospective study was conducted in Wuhan University Renmin Hospital, Hubei Province, China, during the years 2011-2019. The joinpoint regression analysis was used to find a trend in the delayed childbearing and the multiple binary logistic regression model was used to estimate the association between maternal age and pregnancy outcomes.

RESULTS

Between 2011 and 2019, the trend in advanced maternal age (AMA ≥35 years) increased by 75% [AAPC 7.5% (95% CI: - 10.3, 28.9)]. Based on maternal education and occupation, trend in AMA increased by 130% [AAPC 11.8% (95% CI: 1.1, 23.7)] in women of higher education level, and 112.5% [AAPC 10.1% (95% CI: 9.4, 10.9)] in women of professional services. After adjusting for confounding factors, AMA was significantly associated with increased risk of gestational hypertension (aOR 1.5; 95% CI: 1.2, 2.1), preeclampsia (aOR 1.6; 95% CI: 1.4, 1.9), sever preeclampsia (aOR 1.7; 95% CI: 1.1, 2.6), placenta previa (aOR 1.8; 95% CI: 1.5, 2.2), gestational diabetes mellitus (aOR 2.5; 95% CI: 2.3, 2.9), preterm births (aOR 1.6; 95% CI: 1.4, 1.7), perinatal mortality (aOR 1.8; 95% CI: 1.3, 2.3), and low birth weight (aOR 1.3; 95% CI: 1.2, 1.4) compared with women aged < 30 years.

CONCLUSION

Our findings show a marked increase in delayed childbearing and its negative association with pregnancy outcomes.

A Validation Study on the Frequency and Natural History of Miscarriages Using the Spanish Primary Care Database BIFAP

(1) Background: There is a major gap of knowledge towards the natural history of miscarriages in electronic medical records. We aimed to calculate the frequency of miscarriages using data from BIFAP database. (2) Methods: We identified all pregnancy losses and carried out a multistep validation exercise. Potential cases with positive predictive values (PPV) of miscarriage confirmation <85% or those confirming other pregnancy loss were excluded. Kaplan–Meier figures and incidence rates (IRs) of miscarriage with 95% confidence intervals (CIs) expressed by 1000 person-weeks were calculated. Stratifying analysis by age, specific high-risk groups, and drug exposure within the pre-pregnancy period were performed restricted to women with recording last menstrual period (LMP). (3) Results: Women with confirmed miscarriage (N = 18,070), tended to be older, with higher frequency of comorbidities and drug utilization. Restricting to women with LPM recorded, IR of miscarriage was 10.89 (CI 95% 10.68–11.10) per 1000 women-weeks, with a median follow-up of 10 weeks (IQR: 8–12). The IR according to age was: 2.71 (CI 95% 2.59–2.84) in those aged <30 years compared to 9.11 (CI 95% 8.55–9.70) in women aged ≥40 years. Advanced maternal age (Hazard Ratio (HR, 95% confidence interval) CI 95%: 3.34 (3.08–3.62)), use of antihypertensives (1.49 (1.21–1.84), and use of drugs classified as D or X during pregnancy (1.17 (1.07–1.29)) showed to be positive predictors associated with increased risk of miscarriages. (4) Conclusion: BIFAP database can be used to identify women suffering from miscarriages, which will serve to further study risk factors associated with miscarriages with special attention to drug utilization.

Adverse Obstetrical and Perinatal Outcomes Among Advanced Age Pregnant Mothers in Northeast Ethiopia: A Comparative Cross-Sectional Study

Purpose

It is known that being pregnant at any reproductive age is not risk-free. Aside from this, older gravidity usually ends up with adverse outcomes both to the mother and newborn. Hence, the aim of this study was to investigate the association of adverse maternal and perinatal outcomes with advanced maternal age pregnancy in Northeastern Ethiopia.

Methods

A hospital-based comparative cross-sectional study was employed among pregnant mothers. The study was conducted among advanced age (≥35 years, n= 398) mothers and adult age (20–34 years, n=398) mothers. Socio-demographic, obstetrics, and pregnancy outcomes were checked from patient records. Descriptive statistics were used to describe parameters collected from patient records and comparing the two groups. Bivariable and multivariable logistic regressions were done to determine factors associated with maternal and perinatal outcomes. The magnitude of the association was measured using odds ratio at 95% confidence level and statistical significance was declared at a P-value of < 0.05.

Results

Advanced age mothers had significantly higher adverse pregnancy outcomes (64.6% vs 37.8%) compared with adult age mothers. This study shows that advanced maternal age is statistically associated with pregnancy-induced hypertension (AOR=3.14, 95% CI: 1.931–5.089), antepartum hemorrhage (AOR=2.22, 95% CI: 1.245–3.942), a cesarean delivery (AOR=2.59, 95% CI: 1.775–3.790), and postpartum hemorrhage (AOR=2.01, 95% CI: 1.445–2.819). Moreover, advanced maternal age pregnancy was also a risk factor for preterm delivery (AOR=3.01, 95% CI: 1.441–6.297), low birth weight (AOR=3.08, 95% CI: 1.735–5.492), low fifth minute Apgar score (AOR=3.99, 95% CI: 2.099–7.618), and perinatal death (AOR= 2.46, 95% CI: 1.360–4.42).

Conclusion

In this study, adverse pregnancy and perinatal outcomes among advanced aged mothers were high in a specialized hospital where emergency obstetric and newborn care is set and quality obstetric care is expected. Therefore, healthcare providers, the specialized hospital, and policymakers should give due emphasis to the effective intervention of advanced age pregnant mothers.

Factors associated with childbirth self-efficacy: a multicenter cross-sectional study in China

OBJECTIVE

Childbirth self-efficacy is an important indicator of a woman's choice of mode of delivery, and has been found to be closely related to adverse perinatal outcomes. This study was conducted to evaluate childbirth self-efficacy and its influencing factors among pregnant Chinese women.

DESIGN

A multicenter cross-sectional study.

METHODS

Pregnant women were recruited by using a convenience sample in four maternal and child healthcare hospitals, one each from four cities in China between May and June 2018. Women with a singleton pregnancy, aged 18 years and older, and able to read and write the Chinese language were included. Trained investigators used a structured self-administrated questionnaire to collect data. EpiData 3.1 was used to prepare the database, and SAS 9.2 was used for statistical analysis. A one-way ANOVA test or independent sample t-tests were used to test the between-group differences in childbirth self-efficacy scores, as appropriate. Multivariate linear regression analyses were conducted to examine childbirth self-efficacy of the pregnant women, and the socio-demographic and obstetric factors that influence childbirth self-efficacy.

FINDINGS

A total of 1,796 pregnant Chinese women with singleton pregnancies were recruited into this study. The average childbirth self-efficacy score of the participants was 14.42 (standard deviation = 2.80); 9.35% of the participants scored ≤ 10 points, while 22.49% got more than 15 points. Multivariate linear regression analysis revealed that higher childbirth self-efficacy was significantly associated with younger age (ß = -0.05, P<0.01), lower body mass index (BMI) (ß = -0.06, P <0.01), receiving prenatal education (ß = 0.47, P <0.01), performing physical activity 6-7 times per week (ß = 0.47, P = 0.03), and fair (ß = 0.57, P <0.01) or good (ß = 1.08, P <0.01) self-rated health status.

KEY CONCLUSIONS AND IMPLICATIONS FOR PRACTICE

Childbirth self-efficacy was low among pregnant Chinese women. Women with older age, higher BMI, and worse self-rated health status had lower childbirth self-efficacy. On the other hand, women who frequently exercised, had some prenatal education, and had better self-rated health showed higher childbirth self-efficacy during pregnancy. Interventions concentrating on improving childbirth self-efficacy in China should focus on prenatal education for expectant mothers, and more attention should be given to pregnant women who are older, obese, are less physically active, and are in poor health.

Association between maternal age and adverse perinatal outcomes in Arba Minch zuria, and Gacho Baba district, southern Ethiopia: a prospective cohort study

Background

Globally, delayed childbearing to the advanced age is a growing option. It is an emerging public health issue in developing countries. Currently, adverse perinatal outcomes significantly increased. A few studies showed the effect of advanced maternal age on adverse perinatal outcomes. However, most used secondary data or chart reviews, and this increases the risk of biases. Besides, there are limited studies in-country Ethiopia as advanced maternal age steadily increased. Therefore, this study aimed to assess the status of advanced maternal age and its effect on perinatal outcomes in the study setting.

Methods

A community-based prospective cohort study was conducted among 709 study participants from October 15, 2018, to September 30, 2019, in Arba Minch zuria, and Gacho Baba district, southern Ethiopia. The data were collected by a pretested interviewer-administered structured Open Data Kit survey tool and analyzed by SPSS version 25. The log-linear regression model was used to compare perinatal outcomes among women aged 20–34 years and ≥ 35 years. The log-likelihood ratio tested for the goodness of fit. In this study, P-value < 0.05 was considered to declare a result as a statistically significant association.

Results

In this study, 209(29.5%) of the women were age group ≥35 years old, and 500(70.5%) were age group from20–34 years old. Stillbirth (β = 0.29, 95%CI: 0.05, 0.52), and neonatal mortality (β = 0.11, 95%CI: 0.01, 0.21) were significantly associated with the advanced maternal age.

Conclusions

Perinatal outcomes such as stillbirth and neonatal mortality were independently associated with advanced maternal age after controlling for possible cofounders. Therefore, different strategies should design for the women who planned to bear child, and information should provide for women who are advanced age or delayed childbearing to alert them.

Advanced maternal age pregnancy and its adverse obstetrical and perinatal outcomes in Ayder comprehensive specialized hospital, Northern Ethiopia, 2017: a comparative cross-sectional study

Background

Advanced maternal age generally denotes age after 35 years during the time of delivery. Despite the fact that being pregnant at any reproductive age is not risk-free, older gravidity usually culminates with adverse outcomes both to the mother and fetus or neonate. This study aimed to determine the association of adverse obstetrical and perinatal outcomes with advanced maternal age pregnancy. The study was conducted in Ayder comprehensive specialized hospital, north Ethiopia, from 2015 to 2017.

Methods

chart review comparative cross-sectional study was employed. Data were retrieved from medical charts of 752 pregnant mothers (376 each for both the study;> 35-year-old and reference group;20-34 year old). Data was collected using a pretested and structured checklist using systematic sampling and data was entered & analyzed using SPSS version 20. Binary and multivariable logistic regression was run to determine the association of independent variables with dependent variables.

Results

This study revealed that advanced maternal age pregnancy was significantly associated with pregnancy induced hypertension [AOR 4.15, 95% CI (2.272–7.575), p <  0.001], ante partum hemorrhage [AOR 2.54, 95% CI (1.32–4.91), P = 0.005] & cesarean delivery [AOR 2.722, 95% CI (1.777–4.170), p <  0.001]. Furthermore, advanced maternal age pregnancy was also increasingly associated with adverse perinatal outcomes like preterm delivery [AOR 3.622, 95% CI (1.469–8.930), p = 0.005], low birth weight [AOR 3.137, 95% CI (1.324–7.433), p = 0.009], perinatal death [AOR 2.54, 95% CI (1.141–5.635), p = 0.022] and low fifth minute APGAR score [AOR 7.507, 95% CI (3.134–17.98), p <  0.001]. Notwithstanding this, maternal age was not found to be associated with amniotic fluid disturbances, premature rupture of membranes and post-term pregnancy.

Conclusions

Advanced maternal age is markedly linked with adverse obstetrical and perinatal outcomes. Therefore, it is better for health care providers to counsel couples, who seek to have a child in their later ages, about the risks of advanced maternal age pregnancy. In addition, health care workers need to emphasize on how to improve advanced age mothers’ health through the utilization of contraception to reduce pregnancy in this age group.

Prevalence and contributing factors of birth asphyxia among the neonates delivered at Nigist Eleni Mohammed memorial teaching hospital, Southern Ethiopia: a cross-sectional study

BACKGROUND

Birth asphyxia is a major contributor to neonatal mortality worldwide. In Ethiopia, birth asphyxia remains a severe condition that leads to significant mortality and morbidity. This study aims to assess the prevalence and contributing factors of birth asphyxia among the neonates delivered at the Nigist Eleni Mohammed Memorial Teaching Hospital, Southern Ethiopia.

METHODS

This hospital-based cross-sectional study was carried out on 279 participants using the systematic sampling method during June 1-30, 2019. Data were collected using a pretested structured interviewer administered questionnaire, check list and chart review, which was used to retrieve medical information and mother's test results that could not be captured by the interview. Data were entered into EpiData (version 3.1) and analyzed using SPSS software (version 24). Multivariable regression analysis was used to identify the association between the independent variables and outcome variable with a 95% confidence interval (CI).

RESULT

The overall prevalence of birth asphyxia among newborns was found to be 15.1%. Factors that were significantly associated with birth asphyxia included mothers aged ≥35 (AOR = 6.4; 95% CI = 2.0-20.5), primigravida (AOR = 5.1; 95% CI =2.0-13.3), prolonged second stage of labor (AOR = 4.6; 95%CI =1.6-13.3), preterm birth (AOR = 4.7; 95% CI =1.5-14.1), meconium stained amniotic fluid (AOR = 7.5; 95% CI =2.5-21.4) and tight nuchal (AOR = 3.1; 95% CI =1.2-9.3).

CONCLUSION

Birth asphyxia is still prevalent in the study setting. The obtained findings indicated that the mothers aged ≥35, being primigravida, preterm birth, meconium stained amniotic fluid and tight nuchal were the factors associated with birth asphyxia. The results of this study show the need for better maternal care, creating awareness about contributing factors of birth asphyxia to the maternity health professionals, careful monitoring of labor, and identifying and taking proper measures that could help in reducing the occurrence of birth asphyxia.

Advanced maternal age and factors associated with neonatal near miss in nulliparous and multiparous women

The early neonatal period accounts for approximately half of the deaths of young children under one year of age, and the neonatal near miss can recognize factors causing this high number of deaths. Thus, the aim of this study is to determine whether advanced maternal age increases the chance of neonatal near miss, in addition is to identify which factors are associated with the neonatal near miss, stratified by parity. Data are from the 2011-2012 Birth in Brazil study, which used a national population-based sample of 15,092 newborns of women between 20-29 and 35 years of age or more (advanced maternal age). Multiple logistic regression was performed to test the association between neonatal near miss and prenatal and childbirth variables, pre-gestational diseases, obstetric history and socioeconomic characteristics, stratified by parity. Advanced maternal age was to be statistically associated with neonatal near miss in nulliparous (OR = 1.62; 95%CI: 1.05-2.50) and multiparous (OR = 1.51; 95%CI: 1.20-1.91) when compared to women 20-29 years of age. For nulliparous women, the main variables statistically associated with neonatal near miss were multiple gestation (OR = 8.91) and hypertensive disease (OR = 2.57), whereas forceps-assisted vaginal delivery (OR = 7.19) and multiple gestation (OR = 4.47) were the variables associated for multiparous women. Neonatal near miss has been shown to be connected with access to health services for childbirth, gestational complications and maternal characteristics, mainly advanced maternal age. Therefore, to properly monitor and classify maternal gestational risk, to control gestational complications during prenatal care, and to correctly refer these women to childbirth care should be priority strategies for healthcare services.

Association between advanced maternal age and maternal and neonatal morbidity: A cross-sectional study on a Spanish population

Background and objective

Over recent decades, a progressive increase in the maternal age at childbirth has been observed in developed countries, posing a health risk for both women and infants. The aim of this study was to analyze the association between advanced maternal age (AMA) and maternal and neonatal morbidity.

Material and methods

A cross-sectional study of 3,315 births was conducted in the north of Spain in 2014. We compared childbirth between women aged 35 years or older, with a reference group of women aged between 24 and 27 years. AMA was categorized based on ordinal ranking into 35–38 years, 39–42 years, and >42 years to estimate a dose-response pattern (the older the age, the greater the risk). As an association measure, crude and adjusted Odds Ratios (OR) were estimated by non-conditional logistic regression and 95% Confidence Intervals (95%CI) were calculated.

Results

Repeated abortions were more common among women of AMA in comparison to pregnant women aged 24–27 years (reference group): adjusted OR = 2.68; 95%CI (1.52–4.73). A higher prevalence of gestational diabetes was also observed among women of AMA, reaching statistical significance when restricted to first time mothers: adjusted OR = 8.55; 95%CI (1.12–65.43). In addition, the possibility of an instrumental delivery was multiplied by 1.6 and the possibility of a cesarean by 1.5 among women of AMA, with these results reaching statistical significance, and observing a dose-response pattern. Lastly, there were associations between preeclampsia, preterm birth (<37 weeks) and low birthweight, however without reaching statistical significance.

Conclusion

Our results support the association between AMA and suffering repeated abortions. Likewise, being of AMA was associated with a greater risk of suffering from gestational diabetes, especially among primiparous women, as well as being associated with both instrumental deliveries and cesareans among both primiparous and multiparous women.

Pregnancy and advanced maternal age-The associations between regular exercise and maternal and newborn health variables

INTRODUCTION

Despite the associations between delayed childbearing and poorer maternal and perinatal outcomes, little is known about these issues in regular exercisers and in women with healthy lifestyles. The aims of the present study were to: (a) compare lifestyle variables and exercise, pregnancy and birth outcomes in women ≥35 years and women <35 years of age, and (b) investigate the associations between regular exercise and maternal health and newborn variables in women of advanced maternal age.

MATERIAL AND METHODS

Healthy pregnant women (≥35 years, n = 104 and <35 years, n = 362) were allocated to the study from Rikshospitalet, Oslo University Hospital, Norway. The participants completed a validated self-administered questionnaire, the Physical Activity Pregnancy Questionnaire (PAPQ) in gestational weeks 32-36. Prepregnancy body weight (kg) was self-reported, whereas maternal weight (kg) was measured at gestational weeks 14-16, 22-24, 30-32, and 36-38. Details of the delivery (gestational week at delivery, mode of delivery, Apgar score) and birthweight (g) were obtained from the hospital's medical records.

RESULTS

More women <35 than ≥35 years of age reported to have exercised prepregnancy (83.7% vs 74.0%, P = 0.04) and in the 1st trimester (71.2% vs 61.5%, P = 0.05). At gestational week 36, fewer than 50% were exercising regularly, with no group differences (P = 0.74). Current alcohol use (10.5% vs 3.3%, P = 0.02) and tobacco use (5.8% vs 1.7%, P = 0.02) were higher among women ≥35 than women <35 years, whereas for healthy diet the result was reversed (<35 years 67.1% and ≥35 years 80.8%, P = 0.02). There were higher rates of post-term birth (13.5% vs 6.4%, P = 0.02) and induction of labor (40.5% vs 27.9%, P = 0.02) in the ≥35 years group, otherwise no other differences were observed in perinatal outcomes. In women with advanced maternal age, exercising ≥2 times weekly was associated with less pelvic girdle pain (40.0% vs 61.1%, P = 0.02), lower gestational weight gain (12.7 ± 4.0 kg vs 15.5 ± 5.5 kg, P < 0.01), fewer had gestational weight gain ≥16 kg (22.0% vs 51.9%, P < 0.01) and a newborn with macrosomia (10.0% vs 37.0%, P < 0.01). The results were unchanged after adjusting for recognized confounders.

CONCLUSIONS

The results indicate that regular exercise is associated with improvement in some of the risks of advanced maternal age.

Evaluation of Pregnancy Outcomes at Advanced Maternal Age

AIM

The study aimed to investigate the association between advanced maternal age (AMA) and the risk of adverse maternal, perinatal and neonatal outcomes about parity in singleton pregnancies.

METHODS

We retrospectively analysed 950 women who gave birth in the Department of Obstetrics and Perinatology of the University Hospital in Kraków for six months (between 1st January and 30th June 2018). The patients were divided into 3 groups according to their age (30-34 years old, 35-39 years old and over 40 years old). Each of these groups was subsequently subdivided into 2 groups depending on parity (primiparae and multiparae). Maternal, perinatal and neonatal outcomes were compared between the groups and the subgroups.

RESULTS

Comparison of the three age groups revealed that advanced maternal age might constitute a predisposing factor for preterm birth, caesarean section and large for gestational age (LGA). From these parameters, statistical significance was reached in case of greater risk of LGA (OR = 2.17), caesarean section (OR = 2.03) and elective C-section (OR = 1.84) in women over 40 years old when compared to the patients aged 30-34. Furthermore, AMA increases the risk of postpartum haemorrhage (OR = 6.43). Additionally, there is a negative correlation between maternal age and gestational age at delivery (R = -0.106, p < 0.05).

CONCLUSIONS

Advanced maternal age can undoubtedly be associated with several adverse perinatal outcomes. At the same time, the risk of perinatal complications begins to increase after the age of 35 but becomes significant in women aged ≥ 40.

Association between violence during pregnancy and preterm birth and low birth weight in Colombia: Analysis of the demographic and health survey

To explore the association between low birth weight and preterm birth with violence during pregnancy, we conducted a cross-sectional study by using the 2010 Colombian Demographic and Health Survey. We conducted bivariate analyses, binomial logistic regression, and stratified models by age, and 14,520 women were included. There was no association between violence and low birth weight. Nonetheless, an association with preterm birth in women aged over 35 was observed (OR 1.98, 95%CI 1.23, 3.17). Prenatal care appeared to be a protective factor for both outcomes. This research unexpectedly showed that supplementation with folic acid and iron was associated with preterm birth.

Gestación y parto en mujeres con edad materna avanzada en Tunja, Colombia. 2011-2015

Introducción. La gestación en mujeres >35 años se considera una condición de riesgo obstétrico, tanto para la madre como para el feto.Objetivo. Explorar la prevalencia y los factores determinantes asociados con la gestación en mujeres >35 años en Tunja.Materiales y métodos. Estudio de corte transversal en el que se analizó el registro institucional de partos ocurridos en mujeres residentes en Tunja durante el período 2011-2015.Resultados. Se presentaron 1 558 partos en >35 años, lo que constituye el 11.6-13% del total anual; 49.8% de los partos se dieron mediante cesárea. Los factores asociados fueron afiliación al régimen contributivo, escolaridad de la gestante y de su pareja, hábitat urbano y pareja estable. No se encontró riesgo incrementado de complicaciones obstétricas en comparación con otros grupos de edad, pero sí asociación positiva con mayor probabilidad de prematurez, sobrepeso, óbito fetal previo y operación cesárea.Conclusiones. La incidencia de parto es ligeramente mayor a la media nacional, quizás por factores sociales y culturales no establecidos con plenitud, pero similares a los reportados en la literatura. Es recomendable profundizar en el análisis de determinantes para mejorar las estrategias de vigilancia y control, así como rutinas de tamizaje.

The effect of fertility treatment on adverse perinatal outcomes in women aged at least 40 years

OBJECTIVE

To compare perinatal outcomes between spontaneous conception and assisted reproductive technologies (ART) among patients of advanced maternal age.

METHODS

The present retrospective study included data from singleton pregnancies of women aged at least 40 years who delivered between January 1, 1991, and December 31, 2013, at Soroka University Medical Center, Beer Sheva, Israel. Demographic, obstetric, and perinatal data were compared between pregnancies conceived with ART (in vitro fertilization [IVF] or ovulation induction) and those conceived spontaneously. Multiple regression models were used to define independent predictors of adverse outcomes.

RESULTS

A total of 8244 singleton pregnancies were included; 229 (2.8%) following IVF, 86 (1.0%) following ovulation induction, and 7929 (96.2%) were spontaneous. Preterm delivery (P<0.001), fetal growth restriction (FGR) (P<0.001), and cesarean delivery (P<0.001) demonstrated linear associations with the conception mode; the highest rates for each were observed for IVF, with decreased rates for ovulation induction and spontaneous conception. The incidence of gestational diabetes and hypertensive disorders were highest among pregnancies following ART. No association was observed between conception mode and perinatal mortality. Multivariate logistic regression demonstrated that IVF was independently associated with increased odds of preterm delivery (P<0.001) and FGR (P=0.027) compared with spontaneous conception.

CONCLUSIONS

Among patients of advanced maternal age, ART were independently associated with increased FGR and preterm delivery rates compared with spontaneous pregnancies; perinatal mortality was comparable.

Serum thyroid hormone levels among Chinese pregnant women

AIM

The aim of this study is to examine gestational serum thyroid hormone levels and influencing factors among Chinese pregnant women with high dietary iodine intake.

METHODS

The study was conducted from 2011 and 2013 in Zhoushan Women & Children's Hospital, Zhejiang, China. A total of 1991 pregnant women were enrolled and their serum levels of free thyroid hormones (FT₄, FT₃, and TSH) were detected by chemiluminescence method.

RESULTS

Gestational serum FT₄ and FT₃ decreased with gestational week while TSH increased. Furthermore, the prevalence rate of subclinical hypothyroid increased with gestational stages, especially in the third trimester. Women aged more than 30 years had lower FT₄ and FT₃ in the first trimester and lower FT₄ in the second trimester. No significant difference was found in the association of gestational serum thyroid hormones with maternal height and the gender of fetuses.

CONCLUSION

Gestational serum thyroid hormones significantly changed with gestational week and were associated with the age of women. Specific normal range of thyroid hormones might be modified so as to better evaluate the thyroid hormone levels of pregnant women during pregnancy.

Advanced Maternal Age Worsens Postpartum Vascular Function

The age at which women experience their first pregnancy has increased throughout the decades. Pregnancy has an important influence on maternal short- and long-term cardiovascular outcomes. Pregnancy at an advanced maternal age increases maternal risk of gestational diabetes, preeclampsia, placenta previa and caesarian delivery; complications which predict worsened cardiovascular health in later years. Aging also independently increases the risk of cardiovascular disease; therefore, combined risk in women of advanced maternal age may lead to detrimental cardiovascular outcomes later in life. We hypothesized that pregnancy at an advanced maternal age would lead to postpartum vascular dysfunction. We used a reproductively aged rat model to investigate vascular function in never pregnant (virgin), previously pregnant (postpartum) and previously mated but never delivered (nulliparous) rats at approximately 13.5 months of age (3 months postpartum or equivalent). Nulliparous rats, in which pregnancy was spontaneously lost, demonstrated significantly reduced aortic relaxation responses (methylcholine [MCh] Emax: 54.2 ± 12.6%) vs. virgin and postpartum rats (MCh Emax: 84.8 ± 3.5% and 84.7 ± 3.2% respectively); suggesting pregnancy loss causes a worsened vascular pathology. Oxidized LDL reduced relaxation to MCh in aorta from virgin and postpartum, but not nulliparous rats, with an increased contribution of the LOX-1 receptor in the postpartum group. Further, in mesenteric arteries from postpartum rats, endothelium-derived hyperpolarization (EDH)-mediated vasodilation was reduced and a constrictive prostaglandin effect was apparent. In conclusion, aged postpartum rats exhibited vascular dysfunction, while rats which had pregnancy loss demonstrated a distinct vascular pathology. These data demonstrate mechanisms which may lead to worsened outcomes at an advanced maternal age; including early pregnancy loss and later life cardiovascular dysfunction.