Cesarean section rates in Lithuania using Robson Ten Group Classification System

Robson ten group classification system for Caesarean sections across Europe: A systematic review and meta-analysis

The aim of this systemic review and meta-analysis was to examine the differences in caesarean section rates across European regions and at a country level by utilizing the Robson classification system. The study has compared caesarean rates across European regions using the Robson classification to identify the drivers of caesarean section use. This review shows significant variations in caesarean section rates across European regions, ranging from 16.9 % in Northern Europe to 43.6 % in Southern Europe. There was a higher contribution of previous CS (Robson Group 5), ranging from 51.2 to 95.0 % of CS in this group to overall rates, particularly in Southern Europe (95.0 %), raises concerns about the "domino effect" of primary caesareans. This finding emphasises the critical importance of strategies to reduce primary CS rates.

BACKGROUND

Caesarean section (CS) rates exhibit considerable global variation, reflecting diverse medical practices, cultural attitudes, and healthcare policies. While some regions maintain relatively low rates, others report significantly higher incidences of the procedure. Analysing these differences is crucial for understanding and developing targeted healthcare strategies and ensuring optimal maternal and neonatal outcomes. This review examines differences in CS rates in Europe according to the Robson 10 group classification.

METHODS

We identified articles between January 2000 to June 2023 using MEDLINE/PubMed, CINAHL, EMBASE, Global Index Medicus, Web of Science and Cochrane library. There was no restriction on patient population, except for birth in a country of the European region. We excluded all studies that were conference proceedings and studies reported in a language other than English and Swedish.

FINDINGS

The search generated a total of 1024 studies, out of which 44 were included, encompassing 6,641,615 births. The majority were from Northern (38 %) and Western Europe (33.5 %). CS rates varied markedly across Europe, ranging from 16.9 % in Northern region to 43.6 % in Southern Europe. The highest contribution to CS rates came from Robson Group 5 (previous CS), with contributions ranging from 51.2 % in Northern to 95.0 % in Southern Europe. The mode of birth for Robson Group 6 (nulliparous, breech) was predominately by CS (88.8 % in Northern to 92.5 % in Central-Eastern Europe).

INTERPRETATION

CS rates continue to vary widely across Europe, with the highest rates in Southern and the lowest in Northern Europe. Previous CS and breech presentation were prominent drivers of CS rates. Region-specific strategies are needed to address these diverse factors to minimise accelerating CS rates across Europe.

Obstructed Labor, Evolution, and Health Disparities

The female pelvis is often evolutionarily described as a compromise to accommodate the birthing process and bipedalism. This compromise puts a mother and baby at risk of fetopelvic disproportion, the mismatch between the size of the fetus and that of the mother's pelvis, impacting the ease with which the vaginal birthing process occurs. Obstructed labor, commonly caused by fetopelvic disproportion, is a leading cause of maternal mortality and morbidity and has serious medical sequelae for the fetus. In this review, this evolutionary aspect of fetopelvic disproportion is reconsidered within a broader sociocultural and environmental approach related to a change of paradigm from a more reductionist Neo-Darwinist to a more encompassing Extended Evolutionary Synthesis view. The review explores a more comprehensive understanding of several factors related to fetopelvic disproportion, including socioeconomic factors and ethnic disparities among individuals that might lead to a higher likelihood of obstructed labor and maternal and fetal morbidity and mortality.

Cesarean delivery rates based on time and indication using the Robson Ten-Group Classification System: Assessment at a Turkish tertiary center

OBJECTIVE

This study aimed to evaluate increasing cesarean delivery (CD) rates, their causes, and changes over the years in a Turkish tertiary center using the Robson Ten-Group Classification System (RTGCS).

METHODS

Data of deliveries involving birth weight of ≥500 g or ≥24 weeks of gestation period from 2013 to 2020 were retrospectively collected and classified from the hospital digital record system using obstetric concepts and parameters described in the RTGCS.

RESULTS

The overall CD rate for all births (69051) from 2013 to 2020 was 55.5%. Groups 3, 5, and 1 were the most represented groups (29.1%, 23.9%, and 19.4%, respectively). The major contributors to the overall CD rate were Groups 5, 2, and 10 (23.8%, 9.9%, and 5.6%, respectively). Groups 2 and 4 (nullipara, multipara, single cephalic at term) had high CD rates associated with high rates of pre-labor CD (88.9% and 73.3%, respectively). The CD rate was 99.7% in Group 5, which showed recurrent CD, and 67.2% in Group 10. The overall CD rate was 60.8% in 2020 owing to the significant increase in the contributions by Groups 5, 8, and 10. The most common indication for CD was previous CD (46.1%), fetal distress (13.2%), and cephalopelvic disproportion (CPD) (8%).

CONCLUSION

Groups 1, 2, 5, and 10 were the major contributors to the overall CD rate at this tertiary center. To reduce overall CD rates, policies that reduce primary CD and support vaginal delivery after cesarean section should be established.

Analysis of cesarean section rates and its indications using robson's classification at a tertiary care hospital, Manipur

Context

The World Health Organization proposed the Robson's classification system as a global standard for assessing and comparing cesarean section (CS) rates within health-care facilities over time and between facilities.

Aims

This study aims to assess the frequency and indications of CS and to identify the groups within the obstetric population contributing to CS using Robson's classification.

Settings and Design

A retrospective chart review was conducted in a Tertiary Care Teaching Hospital in Imphal, Manipur.

Methods

All women who delivered between January and December 2019 were classified using the Robson's Ten Group Classification System. The overall CS rate and the CS rate in each Robson's group were calculated. The indications for CS were also recorded.

Statistical Analysis Used

Descriptive statistics, such as frequency, percentage, mean, and standard deviation, was used.

Results

A total of 10,282 births were reported. The overall CS rate was 35.2%. Group 3 (multiparous women without previous CS in spontaneous labor) (27.6%) and Group 1 (nulliparous women in spontaneous labor) (23.7%) contributed to most of the obstetric populations. The majority of CS belonged to the women in Group 5 (multiparous women with previous lower segment CS) (11%), followed by Group 2 (nulliparous women with labor induced or prelabor CS) (8.6%) and Group 4 (multiparous women without previous CS were induced or taken for prelabor CS) (5.5%).

Conclusions

The study revealed that Groups 5, 2, and 4 contributed to the high CS rate. Efforts to reduce the overall CS rate should be directed at increasing vaginal births after CS, performing effective pelvic examinations, and encouraging obstetricians to perform versions when indicated.

Examining Cesarean Delivery Rates by Race: a Population-Based Analysis Using the Robson Ten-Group Classification System

The Robson Ten-Group Classification System is widely considered to be the gold standard for comparing cesarean section (CS) delivery rates, despite limited adoption in the United States (US). When reporting overall CS rates, Blacks and other minorities are typically reported to have high CS rates but comparing overall CS rates may be misleading as CS may be more common in some higher risk populations. Improved understanding of how CS rates differ by race among standardized groups could highlight differences in care and areas for improvement. The current study examines racial differences in cesarean section delivery rates using the Robson Ten-Group Classification System in a nationwide sample. Data from US vital statistics live birth certificates were used to identify 3,906,088 births which were each classified into one of the ten groups based on five obstetric characteristics identifiable on presentation for delivery including parity, onset of labor, gestational age, fetal presentation, and number of fetuses. Results indicated that Black and Asian mothers had the highest CS rates in groups 1-4 which all contain single, cephalic pregnancies at term with no prior CS and are only differentiated by parity and onset of labor. Black mothers also had the lowest CS rates for groups 6 and 7, containing women with nulliparous and multiparous breech births. Black and Asian mothers show differences in CS rates among groups that could indicate lack of appropriate care. Efforts should be made to prevent unnecessary primary CS among low-risk mothers.

Symptomatic Uterine Rupture: A Fifteen Year Review

Background and objectives: To assess the incidence of complete and partial uterine rupture during childbirth in a single tertiary referral centre as well as the significant risk factors, symptoms and peripartum complications. Materials and Methods: A retrospective single-centre study involved all cases of uterine rupture at the Kaunas Perinatal Centre in 2004–2019. Data were from a local medical database complemented with written information from medical records. We included 45,893 women with an intact uterus and 5630 with uterine scars. Women (n = 5626) with scarred uterus’ after previous cesarean delivery. The diagnosis was defined by clinical symptoms, leading to an emergency cesarean delivery, when complete or partial uterine rupture (n = 35) was confirmed. Asymptomatic cases, when uterine rupture was found at elective cesarean section (n = 3), were excluded. The control group is represented by all births delivered in our department during the study period (n = 51,525). The outcome was complete (tearing of all uterine wall layers, including serosa and membranes) and partial uterine rupture (uterine muscle defect but intact serosa), common uterine rupture symptoms. Risk factors were parameters related to pregnancy and labour. Results: 51,525 deliveries occurred in Kaunas Perinatal Centre during the 15 years of the study period. A total number of 35 (0.06%) symptomatic uterine ruptures were recorded: 22 complete and 13 partial, leading to an incidence rate of 6.8 per 10,000 deliveries. The uterine rupture incidence rate after a single previous cesarean delivery is 44.4 per 10,000 births. 29 (83%) cases had a uterine scar after previous cesarean, 4 (11%) had a previous laparoscopic myomectomy, 2 (6%) had an unscarred uterus. The most significant risk factors of uterine rupture include uterine scarring and augmentation or epidural anaesthesia in patients with a uterine scar after cesarean delivery. The most common clinical sign was acute abdominal pain in labour 18 (51%). No maternal, six intrapartum perinatal deaths (17%) occurred, and one hysterectomy (2.8%) was performed due to uterine rupture. Neonatal mortality reached 22% among the complete ruptures. Average blood loss was 1415 mL, 4 (11%) patients required blood transfusion. Conclusions: The incidence rate of uterine rupture (complete and incomplete) at Kaunas Perinatal Centre is 6.8 per 10,000 deliveries. In cases with a scar of the uterus after a single cesarean, the incidence of uterine rupture is higher, exceeding 44 cases per 10,000 births. The most significant risk factors were uterine scar and augmentation or epidural anaesthesia in a previous cesarean delivery. Acute abdominal pain in labour is the most frequent symptom for uterine rupture.

Impact of clinical audits on cesarean section rate in a Spanish hospital: Analysis of 6 year data according to the Robson classification

OBJECTIVES

The aim of this study is to analyze the impact of the introduction of an internal clinical audit on the cesarean section (CS) rate, evaluated according to the Robson Ten Group Classification System (TGCS), and to identify the main contributors to the overall CS rate in order to plan further interventions.

STUDY DESIGN

In 2014, an internal clinic audit committee was established in our center. Modifications of clinical management protocols were also implemented. A retrospective review of clinical records was conducted and pre-audit (2011-2014) results were compared against audit (2015-2018) results. Patients were clustered according to the Robson TGCS and the analyzed outcomes were CS rate and maternal and neonatal results.

RESULTS

Between January 2011 and December 2018, 12,766 women gave birth at our institution among which 2,281 CS were analyzed. After the establishment of the clinical audit, the overall CS rate decreased from 20.27% to 14.82 % (p < 0.01). The major contribution to the overall CS rate in both periods were made by Group 2a (nulliparous with a single cephalic pregnancy at term who underwent labor induction: 4.86 % of all cases), followed by Group 5 (patients with a previous C-section: 3.26 %) and Group 1 (nulliparous with a single cephalic pregnancy at term with spontaneous labor: 2.39 %), representing 59.6 % of all CS. The group that showed the greatest reduction to the overall Cs rate was Group 2 (5.77 % vs 3.96 %, OR 1.48 (p < 0.01). No differences in perinatal and maternal results were found between preaudit and audit group.

CONCLUSION

Audit, feedback, and modification of clinical management protocols may be effective in changing clinical practice and reducing CS rates without worsening maternal and neonatal morbimortality. Robson TGCS allowed us to identify which groups had the greatest impact on CS rate in order to establish new strategies that may lead us to optimize the use of this intervention. It seems that efforts to reduce the overall CS rate should be directed on increasing vaginal birth after CS and reducing CS rates in nulliparous women with single cephalic full-term pregnancy.

Cesarean Section Rate Analysis in a Tertiary Hospital in Portugal According to Robson Ten Group Classification System

OBJECTIVE

 The Robson 10 group classification system (RTGCS) is a reproducible, clinically relevant and prospective classification system proposed by the World Health Organization (WHO) as a global standard for assessing, monitoring and comparing cesarean section (CS) rates. The purpose of the present study is to analyze CS rates according to the RTGCS over a 3-year period and to identify the main contributors to this rate.

METHODS

 We reviewed data regarding deliveries performed from 2014 up to 2016 in a tertiary hospital in Portugal, and classified all women according to the RTGCS. We analyzed the CS rate in each group.

RESULTS

 We included data from 6,369 deliveries. Groups 1 (n = 1,703), 2 (n = 1,229) and 3 (n = 1,382) represented 67.7% of the obstetric population. The global CS rate was 25% (n = 1,594). Groups 1, 2, 5 and 10 were responsible for 74.2% of global CS deliveries.

CONCLUSION

 As expected, Groups 1, 2, 5 and 10 were the greatest contributors to the overall CS rate. An attempt to increase the number of vaginal deliveries in these groups, especially in Groups 2 and 5, might contribute to the reduction of the CS rate.

Caesarean section rates from Malaysian tertiary hospitals using Robson's 10-group classification

Background

Rising caesarean section rates is a concern worldwide. This study aimed to use Robson’s ten group classification to identify which groups of women were contributing most to the rising caesarean section rates in Malaysian tertiary hospitals and to compare between hospitals, using a common standard set of variables.

Methods

A 5-year (2011–2015) cross-sectional study was conducted using data from the Malaysian National Obstetrics Registry (NOR). A total of 608,747 deliveries were recorded from 11 tertiary state hospitals and 1 tertiary hospital from the Federal territory.

Results

During the study period, there were 141,257 Caesarean sections (23.2%). Caesarean sections in Group 1 (nulliparous term pregnancy in spontaneous labour) and Group 3 (multiparous term pregnancy in spontaneous labour) had an increasing trend from 2011 to 2015. The group that contributed most to the overall caesarean section rates was Group 5 (multiparous, singleton, cephalic≥37 weeks with previous caesarean section) and the rates remained high during the 5-year study period. Groups 6, 7 and 9 had the highest caesarean section rates but they made the smallest contribution to the overall rates.

Conclusions

Like many countries, the rate of caesarean section has risen over time, and the rise is driven by caesarean section in low-risk groups. There was an important hospital to hospital variation. The rise in caesarean section rates reflects a globally disturbing trend, and changes in policy and training that creates a uniform standard across hospitals should be considered.

The Robson 10-group classification in Iceland: Obstetric interventions and outcomes

BACKGROUND

Rising cesarean rates call for studies on which subgroups of women contribute to the rising rates, both in countries with high and low rates. This study investigated the cesarean rates and contributing groups in Iceland using the Robson 10-group classification system.

METHODS

This study included all births in Iceland from 1997 to 2015, identified from the Icelandic Medical Birth Registry (81 839). The Robson distribution, cesarean rate, and contribution of each Robson group were analyzed for each year, and the distribution of other outcomes was calculated for each Robson group.

RESULTS

The overall cesarean rate in the population was 16.4%. Robson groups 1 (28.7%) and 3 (38.0%) (spontaneous term births) were the largest groups, and groups 2b (0.4%) and 4b (0.7%) (prelabor cesareans) were small. The cesarean rate in group 5 (prior cesarean) was 55.5%. Group 5 was the largest contributing group to the overall cesarean rate (31.2%), followed by groups 1 (17.1%) and 2a (11.0%). The size of groups 2a (RR 1.04 [95% CI 1.01-1.08]) and 4a (RR 1.04 [95% CI 1.01-1.07]) (induced labors) increased over time, whereas their cesarean rates were stable (group 2a: P = 0.08) or decreased (group 4a: RR 0.95 [95% CI 0.91-0.98]).

CONCLUSIONS

In comparison with countries with high cesarean rates, the prelabor cesarean groups (singleton term pregnancies) in Iceland were small, and in women with a previous cesarean, the cesarean rate was low. The size of the labor induction group increased, yet the cesarean rate in this group did not increase.

Caesarean section in Palestine using the Robson Ten Group Classification System: a population-based birth cohort study

OBJECTIVE

To analyse the current situation of caesarean section in Palestine using the Robson Ten Group Classification System (TGCS).

DESIGN

A population-based birth cohort study.

SETTING

Obstetrical departments in three governmental hospitals in Gaza.

PARTICIPANTS

All women (18 908) who gave birth between 1 January 2016 and 30 April 2017.

METHODS

The contributions of each group to the study population and to the overall rate of caesarean section were calculated, as well as the rate of caesarean section in each TGCS group. Differences in proportions between study hospitals were assessed by χ² test.

MAIN OUTCOME MEASURES

The main outcome was the contributions of each group to the overall caesarean section rate.

RESULTS

The overall rate of caesarean section was 22.9% (4337 of 18 908), ranging from 20.6% in hospital 1 to 24.6% in hospital 3. The largest contributors to the overall caesarean section rate were multiparous women with single cephalic full-term pregnancy who had undergone at least one caesarean section (group 5, 42.6%), women with multiple pregnancies (group 8, 11.6%) and those with single cephalic preterm labour (group 10, 8.1%). Statistically significant differences in caesarean section rates between the study hospitals were observed in group 1 (nulliparous women with single cephalic full-term pregnancy and spontaneous labour), group 4 (multiparous with single cephalic full-term pregnancy with induced labour or prelabour caesarean section), group 5 (multiparous with single cephalic full-term pregnancy with previous caesarean section) and in group 7 (multiparous with breech presentation).

CONCLUSION

Women in groups 5, 8 and 10 were the largest contributors to the overall caesarean section rate in the study hospitals. Efforts to reduce the differences in obstetrical care between hospitals need to be directed towards increasing the proportion of vaginal births after caesarean section and by reducing primary caesarean section in multiple pregnancies and preterm labour.

Rate of caesarean sections according to the Robson classification: Analysis in a French perinatal network - Interest and limitations of the French medico-administrative data (PMSI)

INTRODUCTION

The objective of our study was to determine, in accordance with WHO recommendations, the rates of Caesarean sections in a French perinatal network according to the Robson classification and determine the benefit of the medico-administrative data (PMSI) to collect this indicator. This study aimed to identify the main groups contributing to local variations in the rates of Caesarean sections.

MATERIAL AND METHODS

A descriptive multicentric study was conducted in 13 maternity units of a French perinatal network. The rates of Caesarean sections and the contribution of each group of the Robson classification were calculated for all Caesarean sections performed in 2014. The agreement of the classification of Caesarean sections according to Robson using medico-administrative data and data collected in the patient records was measured by the Kappa index. We also analysed a 6 groups simplified Robson classification only using data from PMSI, which do not inform about parity and onset of labour.

RESULTS

The rate of Caesarean sections was 19% (14.5-33.2) in 2014 (2924 out of 15413 deliveries). The most important contributors to the total rates were groups 1, 2 and 5, representing respectively 14.3%, 16.7% and 32.1% of the Caesarean sections. The rates were significantly different in level 1, 2b and 3 maternity units in groups 1 to 4, level 2a maternity units in group 5, and level 3 maternity units in groups 6 and 7. The agreement between the simplified Robson classification produced using the medical records and the medico-administrative data was excellent, with a Kappa index of 0.985 (0.980-0.990).

CONCLUSION

To reduce the rates of Caesarean sections, audits should be conducted on groups 1, 2 and 5 and local protocols developed. Simply by collecting the parity data, the excellent metrological quality of the medico-administrative data would allow systematisation of the Robson classification for each hospital.

Cesarean rates and severe maternal and neonatal outcomes according to the Robson 10-Group Classification System in Khon Kaen Province, Thailand

OBJECTIVE

To assess cesarean rates and maternal and neonatal outcomes in each group in the Robson 10-Group Classification System (TGCS).

METHODS

In a cross-sectional study, data were reviewed from all pregnant women who delivered at 24 government hospitals in Khon Kaen Province, Thailand, in 2014. Delivery and perinatal outcomes were recorded.

RESULTS

Of 18 043 deliveries, 5666 (31.4%) were by cesarean. Women in group 5 (previous cesarean) accounted for the most cesareans (1472, 26.0%). Groups 1 and 2 (nulliparous women) accounted for 2355 (41.6%) of procedures; the rate of cesarean within these two groups was 19.4% (1162/5981) and 71.2% (1193/1675), respectively. As compared with group 1, women in groups 2, 4, 6, 7, and 10 had significantly increased risk of severe maternal outcomes, and those in groups 6, 7, 8, 9, and 10 had an increased risk of severe neonatal outcomes.

CONCLUSION

The rate of cesarean in the study setting was high, and three out of four procedures were performed for women in groups 5, 1, and 2. Interventions should be focused on these groups to reduce the overall cesarean rates.

Use of the 10-Group Classification System to analyze how the population control policy change in China has affected cesarean delivery

OBJECTIVE

To analyze the initial effect following the relaxation of China's population control policy on the cesarean delivery (CD) rate using the 10-Group Classification System (TGCS).

METHODS

A retrospective study included all deliveries at a center in Nanjing, China, during 2014-2015. The deliveries were classified using the TGCS. The obstetric populations and the CD rates in each group were compared between 2014 and 2015.

RESULTS

Overall, 11 006 deliveries were analyzed. The overall CD rate increased from 28.3% (1623/5737) in 2014 to 33.8% (1782/5269) in 2015 (P<0.001). The largest contributor to the overall CD rate-accounting for approximately one-third of all CDs-were nulliparous women with a single cephalic term pregnancy and induced labor or prelabor CD (group 2); the CD rate in this group increased from 27.2% to 31.4%. Moreover, the proportion of women with a single cephalic term pregnancy with previous CD (group 5) steeply increased from 6.4% to 10.4% of all deliveries; the CD rate in this group during 2014-2015 was 76.6%.

CONCLUSION

With China ending its one-child policy, the characteristics of the obstetric population changed. Women with a single cephalic term pregnancy with previous CD were the largest contributor to the CD rate increase.

Are freestanding midwifery units a safe alternative to obstetric units for low-risk, primiparous childbirth? An analysis of effect differences by parity in a matched cohort study

Background

Intrapartum complications and the use of obstetric interventions are more common in primiparous childbirth than in multiparous childbirth, leading to concern about out of hospital birth for primiparous women. The purpose of this study was to determine whether the effect of birthplace on perinatal and maternal morbidity and the use of obstetric interventions differed by parity among low-risk women intending to give birth in a freestanding midwifery unit or in an obstetric unit in the North Denmark Region.

Methods

The study is a secondary analysis of data from a matched cohort study including 839 low-risk women intending birth in a freestanding midwifery unit (primary participants) and 839 low-risk women intending birth in an obstetric unit (individually matched control group). Analysis was by intention-to-treat. Conditional logistic regression analysis was applied to compute odds ratios and effect ratios with 95% confidence intervals for matched pairs stratified by parity.

Results

On no outcome did the effect of birthplace differ significantly between primiparous and multiparous women. Compared with their counterparts intending birth in an obstetric unit, both primiparous and multiparous women intending birth in a freestanding midwifery unit were significantly more likely to have an uncomplicated, spontaneous birth with good outcomes for mother and infant and less likely to require caesarean section, instrumental delivery, augmented labour or epidural analgesia (although for caesarean section this trend did not attain statistical significance for multiparous women). Perinatal outcomes were comparable between the two birth settings irrespective of parity. Compared to multiparas, transfer rates were substantially higher for primiparas, but fell over time while rates for multiparas remained stable.

Conclusions

Freestanding midwifery units appear to confer significant advantages over obstetric units to both primiparous and multiparous mothers, while their infants are equally safe in both settings. Our findings thus support the provision of care in freestanding midwifery units as an alternative to care in obstetric units for all low-risk women regardless of parity. In view of the global rise in caesarean section rates, we consider it an important finding that freestanding midwifery units show potential for reducing first-birth caesarean.

Electronic supplementary material

The online version of this article (doi:10.1186/s12884-016-1208-1) contains supplementary material, which is available to authorized users.

Cesarean Section Rate Analysis in University Hospital Tuzla - According to Robson's Classification

Objective:

For last decades, there has public concern about increasing Cesarean Section (CS) rates, and it is an issue of international public health concern. According to World Health Organisation (WHO) there is no justification to have more than 10-15% CS births. WHO proposes the Robson ten-group classification, as a global standard for assessing, monitoring and comparing cesarean section rates. The aim of this study was to investigate Cesarean section rate at University Hospital Tuzla, Bosnia and Herzegovina.

Methods:

Cross sectional study was conducted for one-year period, 2015. Statistical analysis and graph-table presentation was performed using Excel 2010 and Microsoft Office programs.

Results:

Out of 3,672 births, a total of 936 births were performed by CS. Percentage of the total number of CS to the total birth number was 25,47%. According to Robson classification, the largest was group 5 with relative contribution of 29,80%. On second and third place were group 1 and 2 with relative contribution of 26,06% and 15,78% respectively. Groups 1, 2, 5 made account of realtive contribution of 71,65%. All other groups had entirely relative contribution of 28,35%.

Conclusion:

Robson 10-group classification provides easy way in collecting information about CS rate. It is important that efforts to reduce the overall CS rate should focus on reducing the primary CS. Data from our study confirm this attitude.