How the Structure of Egocentric Facebook Networks is Associated With Exposure to Risky Content for Maltreated versus Comparison Youth

The current study examined the size and connectedness of egocentric Facebook networks as predictors of exposure to risky content among a sample of maltreated and comparison youth (n=118). Social network measures (i.e., size, density, average degree, percent of isolates) were computed from the mutual friend list. A content analysis of posts by friends captured references to alcohol use, marijuana use, partying, and sexual content. Multiple-group path models showed that the larger size of the Facebook network and higher average degree predicted references to marijuana use only for comparison youth, whereas for maltreated youth a higher percent of isolates predicted more references to sexual content by Facebook friends. Structural measures of online networks may have potential utility for identifying those at risk.

Does the source matter? Social support and suicide attempts among homeless youth

The impact of social support on suicide is understudied among youth experiencing homelessness (YEH). This is problematic because assumptions about the protectiveness of relationships may not generalize to conflictive YEH environments. This study, which included 1047 YEH, used path modeling with a logistic regression estimator to examine associations between social support from family, home-based friends, and street-based friends and past-year suicide attempt. Social support from home-based friends but not family or street-based friends decreased suicide attempt risk. Moreover, social support from home-based friends moderated the association between depression and attempt risk. Targeted programming strengthening home-based-friend relationships represents a valuable endeavor.

ACEs are not equal: Examining the relative impact of household dysfunction versus childhood maltreatment on mental health in adolescence

RATIONALE

Adverse Childhood Experiences (ACEs) have shown substantial effects on health across the lifespan. However, many studies on this topic discount the individual items as well as the distinction between household dysfunction and maltreatment experiences.

OBJECTIVE

The current study examined individual ACEs items as well as the relative contribution of the household dysfunction scale versus the childhood maltreatment scale for predicting mental health outcomes in adolescence. Lastly, we examined the utility of a cut-off score for ACEs in predicting mental health.

METHODS

Data were from Time 4 of a longitudinal study of the effects of maltreatment on adolescent development (n = 352; Mean age = 18). Self reported ACEs were assessed via structured interview and mapped onto the original ACEs questionnaire (Kaiser-CDC). Mental health outcomes were symptoms of depression, anxiety, trauma, and externalizing behavior.

RESULTS

MANCOVA showed few mean differences between those endorsing 'yes' versus 'no' for the household dysfunction items, with the exception of witnessing parental Intimate Partner Violence (IPV). Those who endorsed witnessign IPV reported more symptoms of depression, anxiety, and trauma. On the other hand, all of the maltreatment items were asscociated with significantly higher scores on at least three of the four outcomes for those endorsing versus not. Sexual abuse and physical abuse were associated with symptoms of depression, trauma, and externalizing behavior. Neglect was associated with depressive, trauma, and anxiety symptoms. Emotional abuse and emotional neglect were both associated with all four mental health outcomes. When household dysfunction and maltreatment sum scores were entered into the model together, maltreatment primarily accounted for mental health symptoms. Finally, our results did not indicate a meaningful cutoff for the number of ACEs needed to predict mental health outcomes.

CONCLUSIONS

Our findings support the assessment of maltreatment events as more salient than household dysfunction in mental health treatment and caution health providers against only using the total ACEs score in clinical decision-making.

A pilot study examining risk behavior in facebook posts for maltreated versus comparison youth using content analysis

BACKGROUND

Social Media use is highly prevalent among contemporary adolescents yet, no studies have examined the similarity in risk content (e.g., substance use, sexual behaviors) between the online posts of maltreated youth and their friends.

OBJECTIVE

The current study examined the risk content of Facebook posts among a sample maltreated and comparison youth and compared the rates of risk content produced by the participants versus their Facebook friends.

PARTICIPANTS AND SETTING

Data were from a sample of maltreated (n = 56) and comparison (n = 62) youth. At the time of data collection participants were in young adulthood (M = 21.78 years; SD = 1.45), but the timeframe of their Facebook profiles captured mid adolescence to young adulthood.

METHODS

Data were downloaded from the Facebook profiles of all participants and the posts and comments were coded for references to alcohol, marijuana, hard drugs, partying, and sexual content.

RESULTS

The results showed that maltreated and comparison youth were similar in the amount of risky content they posted on Facebook as well as in the amount posted by their Facebook friends. Correlations between participant's and friends' posts showed stronger associations for posts about alcohol use for the maltreated group but stronger associations in the comparison group for posts about marijuana, hard drug, and sexual references. Gender differences were also examined, with males producing more online risky content than females.

CONCLUSIONS

Next steps should incorporate a more nuanced analysis to determine which online friends are the sources of risky content.

The Moderating Role of Cortisol Reactivity on the Link Between Maltreatment and Body Mass Index Trajectory Across Adolescence

PURPOSE

Child maltreatment increases risk for obesity, yet differential effects of maltreatment type remain unclear. Cortisol reactivity may help clarify these effects, given links among cortisol reactivity, maltreatment, and obesity. We examined these associations in boys and girls across adolescence.

METHODS

We collected data from 454 adolescents (212 girls) across four waves (aged 8-13 years at Time 1), including 303 maltreated youth. We modeled body mass index (BMI) percentile trajectories arrayed by age separately for boys and girls and tested whether cortisol reactivity at Time 1 moderated the association between maltreatment type and BMI growth.

RESULTS

In girls, cortisol reactivity moderated the association between maltreatment type and quadratic change in BMI. At low levels of cortisol, sexually abused girls had a steeper quadratic increase in BMI compared with comparison (-.65, 95% confidence interval [CI] -1.09 to -.22) and physically abused (-.76, 95% CI -1.29, -.24) girls. At high levels of cortisol, sexually abused girls did not differ from comparison (.15, 95% CI -.40 to .70) or physically abused (.21, 95% CI -.38 to .80) girls in quadratic change in BMI. In boys, cortisol reactivity did not moderate the association between maltreatment type and BMI growth.

CONCLUSIONS

The combination of lower cortisol reactivity and sexual abuse may put girls at risk for BMI increase during later adolescence. Given the negative consequences of high BMI, identifying and intervening with these girls could lead to better health and well-being among this group. Cortisol reactivity may not play the same role among boys.

Depressive Symptoms Predict Characteristics of Online Social Networks

PURPOSE

There is a substantial body of literature that examines depression or well-being as outcomes of social media use, but there are fewer studies that seek to understand how mental health may lead to different patterns of online interactions. The purpose of the present study was to examine how depressive symptoms may predict subsequent structural characteristics of the online social network.

METHODS

Data came from Time 3 and Time 5 of a longitudinal study on the effects of maltreatment on adolescent development. At Time 3, adolescents reported on their depressive symptoms (n = 319), and at Time 5, a subsample was enrolled in the Facebook data collection (n = 133). An application downloaded the friend list, and network metrics were computed. Path models examined the main effect of depressive symptoms at Time 3 on Facebook social network measures.

RESULTS

The coefficients indicated that higher levels of depressive symptoms at Time 3 predicted fewer Facebook friends (smaller size), fewer ties between friends (lower average degree), more components, and fewer friends in the main component of the network.

CONCLUSIONS

Depression may alter how youth form and maintain online friendships. Using social network characteristics may help identify youth at risk for serious mental illness.

Does Social Support Mediate the Association Between Maltreatment Experiences and Depressive Symptoms in Adolescence

The current study examined social support as a mediator between maltreatment experiences (number of victimizations, maltreatment types) and depressive symptoms in adolescence. The data came from the first two time points of a longitudinal study of the effects of maltreatment on adolescent development. The enrolled sample were 454 male and females ( n = 303 maltreated, n = 151 comparison) between 9 and 13 years ( M _age = 10.82); Time 2 (T2) occurred approximately 1 year after baseline. Maltreatment data came from case records; participants reported on perceived social support and depressive symptoms. Results from path models indicated that depressive symptoms mediated the association between maltreatment experiences (i.e., physical abuse, neglect, and number of maltreatment victimizations) and family social support. There was no evidence that social support functioned as a mediator. This is the first study to find support for depressive symptoms as a mechanism linking maltreatment with decreased perceived family support. These findings point to the importance of assessing mental health and social support simultaneously to understand the functioning of youth with maltreatment histories.

Predictors and correlates of unstable housing experiences among a child welfare-involved sample

The study examined whether youth demographics, family factors, and maltreatment type were related to unstable housing and whether unstable housing predicted delinquency and marijuana use. Participants included 216 child welfare-affiliated adolescents (mean age = 18.2 years). Youth with more lifetime residences were more likely to experience unstable housing although Latino youth (compared to White, Black, or multiethnic/biracial) were less likely to experience unstable housing. Unstable housing was associated with subsequent delinquency. Caregiver type (parent vs. relative/unrelated caregiver) was not related to unstable housing, thus homelessness prevention programs should include youth who remain with their parents and those with non-parent caregivers.

The Influence of Online-Only Friends on the Substance Use of Young Adults with a History of Childhood Maltreatment

BACKGROUND

Existing research shows that having offline friends that use substances increases risk for individual substance use in adolescence. However, there is little research examining the influence of online social networks on substance use in young adulthood.

OBJECTIVES

This study examined the number of online-only Facebook friends (i.e. those with no in-person contact) that were substance users in relation to the participants' alcohol and marijuana use in the past year.

METHODS

The sample (n = 114) were selected from participants enrolled in a longitudinal study on childhood maltreatment in an urban city within the United States. The mean age of the sample was 21.84 (SD = 1.43), 61% female. With participant permission, data were downloaded from Facebook to obtain the list of online friends. A self-report questionnaire recorded the substance use of each participant. Path analysis and logistic regression were used to examine (a) the number of online-only friends who drink as a predictor of participants' problem drinking, (b) the number of online-only friends who smoke marijuana as a predictor of participants' marijuana use, and (c) moderation by maltreatment status.

RESULTS

The results showed a significant effect of the number of online-only friends who smoke marijuana on the participant's marijuana use. However, after including offline friends this significant effect was no longer present, but offline friends predicted individual marijuana use. Conclusions/Importance: These findings demonstrate that substance use in online social networks may be associated with individual use in young adulthood, but that offline influence is stronger.

Suicidal because I don't feel connected or vice versa? A longitudinal study of suicidal ideation and connectedness among child welfare youth

Suicide is a major public health problem among youth involved with the child welfare system. Although social connectedness rests at the core of many prevention approaches, we know little about this relationship over time in this vulnerable population. This study tested the hypotheses that inverse relationships would exist between connectedness in three social domains (i.e., caregiver, peers, and school) and suicidal ideation over time. The current study used baseline and 18-month follow-up data from 995 youth who participated in the National Survey of Child and Adolescent Well-Being (NSCAW II)-a nationally representative study of children and families investigated by a child welfare agency conducted from 2008 to 2011. A cross-lagged path model was used for the analysis. There were significant main effects of suicidal ideation at Time 1 on peer connectedness (β= -.17, p < .01) and caregiver connectedness (β= -.12, p < .05) at Time 2, but not on school connectedness (β= -.05, ns). There was no main effect of any of the connectedness variables at Time 1 on suicidal ideation at Time 2. Screening for suicidal ideation is important for managing immediate risk but our findings suggest that such ideation also foreshadows disconnectedness from their primary caregiver and peers in the future. These findings demonstrate that there is clinical value in engaging child-welfare-involved youth and their social systems about how their suicide-related experiences may affect vital social ties. Therefore, there may be merit to designing and exploring the effects of pilot programming focused on mitigating social distancing that suicide-related experiences engender.

Structural characteristics of the online social networks of maltreated youth and offline sexual risk behavior

Maltreated youth are at risk for exposure to online sexual content and high-risk sexual behavior, yet characteristics of their online social networks have not been examined as a potential source of vulnerability. The aims of the current study were: 1) to test indicators of size (number of friends) and fragmentation (number of connections between friends) of maltreated young adults' online networks as predictors of intentional and unintentional exposure to sexual content and offline high-risk sexual behavior and 2) to test maltreatment as a moderator of these associations. Participants were selected from a longitudinal study on the effects of child maltreatment (n = 152; Mean age 21.84 years). Data downloaded from Facebook were used to calculate network variables of size (number of friends), density (connections between friends), average degree (average number of connections for each friend), and percent isolates (those not connected to others in the network). Self-reports of intentional and unintentional exposure to online sexual content and offline high-risk sexual behavior were the outcome variables. Multiple-group path modeling showed that only for the maltreated group having a higher percent of isolates in the network predicted intentional exposure to online sexual content and offline high-risk sexual behavior. An implication of this finding is that the composition of the Facebook network may be used as a risk indicator for individuals with child-welfare documented maltreatment experiences.

Longitudinal Relationship Between Mental Health Symptoms and Sleep Disturbances and Duration in Maltreated and Comparison Adolescents

PURPOSE

To examine the longitudinal relationships between mental health symptoms and sleep for male and female maltreated and comparison adolescents.

METHODS

Participants were from a longitudinal study of child maltreatment (maltreated n = 247; comparison n = 138). The current analyses used data from Time 3 (T3; average age 13.7 years) and Time 4 (T4; average age 18.2 years). Path models tested cross-lagged effects between mental health symptoms (depression and Post Traumatic Stress Disorder [PTSD]) and sleep (disturbances and duration) and main effects of maltreatment on Time 4 variables, stratified by sex.

RESULTS

Reciprocal relationships between depressive and PTSD symptoms and sleep disturbances were found only for females. Specifically, depressive and PTSD symptoms at T3 predicted sleep disturbances at T4 and sleep disturbances at T3 also predicted depressive and PTSD symptoms at T4. Regarding sleep duration, PTSD symptoms at T3 predicted shorter sleep duration at T4 among females but not for males. There was no effect of maltreatment status on mental health symptoms or sleep disturbance, but maltreated adolescents reported longer sleep duration at T4 than comparison adolescents.

CONCLUSIONS

The reciprocal nature of the relationship between mental health symptoms and sleep disturbances in females highlights the need to treat both mental health symptoms as well as sleep problems in female adolescents to improve mental and physical health. The absence of a negative effect of maltreatment on sleep may be due to the fact that the maltreated youth and comparison youth lived in the same low-income urban communities and were exposed to the same nocturnal environmental irritants.

Longitudinal associations of maternal depression and adolescents' depression and behaviors: Moderation by maltreatment and sex

This study explored the longitudinal relationships among maternal depressive symptoms, children's depressive symptoms, aggression, and rule breaking and tested the moderating effects of maltreatment and child sex. A sample of 175 biological mother-child dyads (86 maltreated and 89 comparison) were seen at three time points, beginning at an average child age of 10.87 years. Results from cross-lagged models showed maternal depressive symptoms were related to higher levels of children's depressive symptoms but not children's aggression or rule breaking. Rule breaking predicted maternal depressive symptoms only in the comparison group. Child sex moderated some relationships. Boys' depression predicted maternal depressive symptoms, whereas maternal depressive symptoms predicted aggression among girls. There was no evidence in this sample that child maltreatment increased the effects of maternal depressive symptoms on child outcomes. These results suggest that attention in clinical practice to the importance of addressing maternal depression as well as addressing children's functioning should continue into adolescence. (PsycINFO Database Record

Concordance Between Self-Reported Childhood Maltreatment Versus Case Record Reviews for Child Welfare-Affiliated Adolescents

The present study used data from an ongoing longitudinal study of the effects of maltreatment on adolescent development to (1) describe rates of maltreatment experiences obtained from retrospective self-report versus case record review for adolescents with child welfare-documented maltreatment histories, (2) examine self-reported versus child welfare-identified maltreatment in relation to mental health and risk behavior outcomes by maltreatment type, and (3) examine the association between the number of different types of maltreatment and mental health and risk behavior outcomes. Maltreatment was coded from case records using the Maltreatment Case Record Abstraction Instrument (MCRAI) and participants were asked at mean age = 18.49 about childhood maltreatment experiences using the Comprehensive Trauma Interview (CTI). Results showed that an average of 48% of maltreatment found by the MCRAI for each type of maltreatment were unique cases not captured by the CTI, whereas an average of 40% self-reported maltreatment (CTI) was not indicated by the MCRAI. Analyses with outcomes showed generally, self-reported maltreatment, regardless of concordance with MCRAI, was related to the poorest outcomes. The difference in associations with the outcomes indicates both self-report and case record review data may have utility depending on the outcomes being assessed.

Childhood Sexual Abuse and Early Timing of Puberty

PURPOSE

The purpose was to examine whether the timing of puberty, indexed by breast development and pubic hair development, was earlier for sexually abused females compared with a matched comparison group of nonabused females, controlling for key alternative confounds.

METHODS

A cohort of sexually abused females and matched comparisons was followed longitudinally at mean ages 11 through 20 years. Sexually abused participants (N = 84) were referred by protective services. Comparison participants (N = 89) were recruited to be comparable in terms of age, ethnicity, income level, family constellation, zip codes, and nonsexual trauma histories. Stage of puberty was indexed at each assessment by nurse and participant ratings of breast and pubic hair development using Tanner staging-the gold standard for assessing pubertal onset and development. Cumulative logit mixed models were used to estimate the association between sexual abuse status and the likelihood of transitioning from earlier to later Tanner stage categories controlling for covariates and potential confounds.

RESULTS

Sexual abuse was associated with earlier pubertal onset: 8 months earlier for breasts (odds ratio: 3.06, 95% CI: 1.11-8.49) and 12 months earlier for pubic hair (odds ratio: 3.49, 95% CI: 1.34-9.12). Alternative explanations including ethnicity, obesity, and biological father absence did not eradicate these findings.

CONCLUSIONS

This study confirms an association between exposure to childhood sexual abuse and earlier pubertal onset. Results highlight the possibility that, due to this early onset, sexual abuse survivors may be at increased risk for psychosocial difficulties, menstrual and fertility problems, and even reproductive cancers due to prolonged exposure to sex hormones.

Maltreated and comparison adolescents' recollections of lifetime residences: Relationship to delinquency and marijuana use

Both childhood maltreatment and frequent childhood residence changes are associated with poor behavioral outcomes including drug use and delinquency. It is not clear whether a higher number of residences results in poorer outcomes for maltreated adolescents compared to adolescents living in the same community but without child welfare-documented maltreatment. Our study of child welfare-affiliated maltreated youth (n=216) and comparison youth (n=128) from the same community (age M = 18.21, SD = 1.42) examined: 1. whether child/caregiver characteristics and maltreatment status were associated with lifetime number of residences and 2. whether child/caregiver characteristics, residences, and maltreatment status were associated with delinquency and marijuana use. The outcomes of this study, number of residences, delinquency, and marijuana use, were all skewed, and consequently negative binomial regressions were used. Maltreatment status, ever living with a non-parent caregiver, and being older are associated with more residence changes during childhood. More residences and male sex are associated with person offense delinquency and marijuana use. In lower income neighborhoods, such as where the adolescents in this study lived, residence changes are not unusual, but in this study maltreated youth moved more often than youth from the same community. It is important to help caregivers who live in disadvantaged neighborhoods, especially families with child welfare involvement, understand the behavioral consequences of residence changes and provide support for stable long-term housing.

Self-Report of Health Problems and Health Care Use among Maltreated and Comparison Adolescents

The study aims were to compare maltreated and comparison adolescents' health problems and to identify how individual, family and home characteristics and maltreatment status affect adolescents' self-report of health status and health care use. The sample was 224 maltreated adolescents (mean age = 18.3 years) and 128 comparison adolescents (mean age = 18.15 years). Comparison adolescents reported more cold and pain symptoms during the previous 30 days but no differences in other physical health problems, self-assessment of their physical and mental health or health care use compared to maltreated adolescents. Girls were more likely to have had a dental checkup, to have seen a psychological counselor, and to self-identify their physical health as poor compared to boys. Older adolescents were less likely to have had a medical checkup or seen a psychological counselor than younger adolescents. A history of maltreatment was not related to health or health care disparities for adolescents growing up in the same low-income environment as adolescents without a maltreatment report. The environmental context and geographical location in which these adolescents grew up may be the primary driver in their health behaviors and health problems and not the experience of maltreatment.

Child Maltreatment and Sexual Risk Behavior: Maltreatment Types and Gender Differences

OBJECTIVE

To compare sexual risk behaviors in maltreated male and female sexually active adolescents with a comparison population and examine whether specific maltreatment experiences were associated with sexual risk behaviors and teen pregnancy.

METHOD

Data came from the fourth assessment (M = 7.2 years after baseline) of an ongoing longitudinal study with case-control design. The sample was restricted to only the sexually active adolescents, leaving a sample of 251 (n = 82 comparison, n = 169 maltreated, mean age = 18.49 years, SD = 1.46). Maltreatment type was coded from case records, and sexual behaviors were assessed via computerized questionnaire.

RESULTS

Maltreated youth were significantly younger at first consensual intercourse than comparison youth, and males were younger than females. Maltreated males reported significantly higher number of lifetime sexual partners than maltreated females. Neglected, sexually abused, and physically abused youth were more likely to have had a one-night stand than comparison youth. Sexually abused females were at higher risk of having sex under the influence than other maltreated females. Neglected females were more likely to have ever been pregnant than females with other maltreatment types or comparison females. A higher number of maltreatment victimizations predicted a younger age at first pregnancy involvement for both sexes.

CONCLUSION

Many maltreated youth continue to be at high risk for engaging in behaviors that may initiate a trajectory of problematic sexual behaviors. The findings highlight maltreated males and neglected females as vulnerable groups that should be targeted in prevention efforts to curtail sexual risk behaviors and prevent teenage pregnancy.

Child Maltreatment and Sexual Risk Behavior: Maltreatment Types and Gender Differences

OBJECTIVE

To compare sexual risk behaviors in maltreated male and female sexually active adolescents with a comparison population and examine whether specific maltreatment experiences were associated with sexual risk behaviors and teen pregnancy.

METHOD

Data came from the fourth assessment (M = 7.2 years after baseline) of an ongoing longitudinal study with case-control design. The sample was restricted to only the sexually active adolescents, leaving a sample of 251 (n = 82 comparison, n = 169 maltreated, mean age = 18.49 years, SD = 1.46). Maltreatment type was coded from case records, and sexual behaviors were assessed via computerized questionnaire.

RESULTS

Maltreated youth were significantly younger at first consensual intercourse than comparison youth, and males were younger than females. Maltreated males reported significantly higher number of lifetime sexual partners than maltreated females. Neglected, sexually abused, and physically abused youth were more likely to have had a one-night stand than comparison youth. Sexually abused females were at higher risk of having sex under the influence than other maltreated females. Neglected females were more likely to have ever been pregnant than females with other maltreatment types or comparison females. A higher number of maltreatment victimizations predicted a younger age at first pregnancy involvement for both sexes.

CONCLUSION

Many maltreated youth continue to be at high risk for engaging in behaviors that may initiate a trajectory of problematic sexual behaviors. The findings highlight maltreated males and neglected females as vulnerable groups that should be targeted in prevention efforts to curtail sexual risk behaviors and prevent teenage pregnancy.

Childhood maltreatment, pubertal development, HPA axis functioning, and psychosocial outcomes: An integrative biopsychosocial model

The timing and pace of pubertal development has been associated with psychosocial functioning, with pubertal variables represented both as predictors (e.g., earlier puberty linked with poor outcomes) and as sequelae (e.g., early stress linked with earlier puberty). However, the literature has largely not tested mediational models or prospective mechanisms of associations between puberty and psychosocial variables. In a longitudinal study including 454 youth followed over four timepoints (mean ages 10-18), structural equation modeling tested a hypothesized path from childhood maltreatment to cortisol (Time 1) to pubertal stage (Time 2), and psychosocial outcomes (Times 3 and 4). There was not support for the full hypothesized pathway in either gender. However, for boys, maltreatment was associated with attenuated cortisol, and more pubertal change predicted subsequent delinquency. For girls, cortisol predicted more pubertal change which then predicted substance use. This study demonstrates links between HPA axis function, pubertal development, and risky outcomes.

Body mass index trajectory throughout adolescence: a comparison of maltreated adolescents by maltreatment type to a community sample

BACKGROUND

Childhood maltreatment is associated with adult obesity, but there is conflicting evidence regarding the relationship between childhood maltreatment and obesity during adolescence.

OBJECTIVES

To compare the body mass index (BMI) trajectory of adolescents with a specific type of maltreatment (sexual abuse, physical abuse, emotional abuse or neglect) to adolescents with another type of maltreatment (maltreated sample n = 303) and to a comparison group (n = 151).

METHODS

Individual growth models were used to estimate average growth trajectories of BMI percentile separately by sex (ages 9 to 22 years). Unconditional and conditional linear and quadratic growth models were estimated and maltreatment types were added before including covariates (ethnicity, anxiety, depression and pubertal stage).

RESULTS

BMI growth trajectories of sexually abused girls and neglected girls were significantly different from comparison girls. Comparison girls had a growth trajectory that reached its apex at 15 years and then began to decline, whereas sexually abused girls and neglected girls had lower BMI than comparison girls until age 16-17 years when their BMI was higher than comparison girls.

CONCLUSIONS

Late adolescence appears to be the developmental period during which differences in BMI percentiles become pronounced between girls with sexual abuse or with neglect vs. comparison girls.

Elucidating the mechanisms linking early pubertal timing, sexual activity, and substance use for maltreated versus nonmaltreated adolescents

PURPOSE

To test models linking pubertal timing, peer substance use, sexual behavior, and substance use for maltreated versus comparison adolescents. Three theoretical mechanisms were tested: (1) peer influence links early pubertal timing to later sexual behavior and substance use; (2) early maturers engage in substance use on their own and then select substance-using friends; or (3) early maturers initiate sexual behaviors which lead them to substance-using peers.

METHODS

The data came from a longitudinal study of the effects of child maltreatment on adolescent development (303 maltreated and 151 comparison adolescents; age, 9-13 years at initial wave). Multiple-group structural equation models tested the hypotheses across three time points including variables of pubertal timing, perception of peer substance use, sexual behavior, and self-reported substance use.

RESULTS

Early pubertal timing was associated with substance-using peers only for maltreated adolescents, indicating the mediation path from early pubertal timing through substance-using peers to subsequent adolescent substance use and sexual behavior only holds for maltreated adolescents. Mediation via sexual behavior was significant for both maltreated and comparison adolescents. This indicates that sexual behavior may be a more universal mechanism linking early maturation with risky friends regardless of adverse life experiences.

CONCLUSIONS

The findings are a step toward elucidating the developmental pathways from early puberty to risk behavior and identifying early experiences that may alter mediation effects.

Pubertal Timing and Tempo: Associations With Childhood Maltreatment

The present study examined pubertal timing and tempo in a sample of 445 adolescents (53% male), using both variable-centered (latent growth curve) and person-centered (latent class) approaches, to discern the pubertal development trajectories associated with the experience of maltreatment. Results from the variable-centered analyses indicated a slower initial tempo that increased later for boys who had experienced neglect. The person-centered results indicated three classes for boys that mainly differentiated tempo effects and two classes for girls primarily distinguishing timing differences. For girls, sexual abuse predicted membership in an earlier pubertal timing class. These findings enhance our knowledge of the variability in pubertal development as well as gender differences in maltreatment types that may alter pubertal timing and tempo.