Melbourne School of Psychological Sciences - Research Publications
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ItemSometimes It's Good to be Short: The Serotonin Transporter Gene, Positive Parenting, and Adolescent Depression(WILEY, 2019-07)In threatening environments, the short (S) allele of 5-HTTLPR is proposed to augment risk for depression. However, it is unknown whether 5-HTTLPR variation increases risk for depression in environments of deprivation, lacking positive or nurturant features. Two independent longitudinal studies (n = 681 and 176, respectively) examined whether 5-HTTLPR moderated associations between low levels of positive parenting at 11-13 years and subsequent depression at 17-19 years. In both studies only LL homozygous adolescents were at greater risk for depression with decreasing levels of positive parenting. Thus, while the S allele has previously been identified as a susceptible genotype, these findings suggest that the L allele may also confer sensitivity to depression in the face of specific environmental challenges.
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ItemMother-Infant and Partner-Infant Emotional Availability at 12 Months of Age: Findings From an Australian Longitudinal Study(WILEY, 2018-11-01)Emotional availability (EA) is a focal indicator of parent–infant relationship quality and plays a key role in determining healthy child development, yet factors thought to influence EA have not been examined comprehensively in the postnatal period in both mothers and partners. The aim of this study was to examine the influence of mother–infant and partner–infant bonding, mental ill‐health and substance use at 8 weeks postbirth on mother–infant and partner–infant EA at 12 months postbirth, accounting for a range of demographic and postnatal variables. Participants were 191 matched mother–partner–infant triads from a nested sample of an Australian longitudinal pregnancy cohort (The Triple B Pregnancy Cohort). Assessments were conducted at 8 weeks postbirth and at infant age 12 months. Parental EA was coded from dyadic interactions during a 20‐min free play observational video recorded at 12 months. Generalized estimating equations (GEE) analysis, accounting for within‐dyad clustering, showed older parent age was associated with higher parent–child EA scores (χ2 = 6.28, p < .01), while parental tobacco use (χ2 = 7.35, p < .01) and depression (χ2 = 4.51, p < .05) at 8 weeks postnatal predicted poorer parent–child EA scores at 12 months. These novel findings suggest that it may be particularly important to support young couples and those struggling with symptoms of depression or tobacco use during the postnatal period.
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ItemRetention strategies in longitudinal cohort studies: a systematic review and meta-analysis(BMC, 2018-11-26)BACKGROUND: Participant retention strategies that minimise attrition in longitudinal cohort studies have evolved considerably in recent years. This study aimed to assess, via systematic review and meta-analysis, the effectiveness of both traditional strategies and contemporary innovations for retention adopted by longitudinal cohort studies in the past decade. METHODS: Health research databases were searched for retention strategies used within longitudinal cohort studies published in the 10-years prior, with 143 eligible longitudinal cohort studies identified (141 articles; sample size range: 30 to 61,895). Details on retention strategies and rates, research designs, and participant demographics were extracted. Meta-analyses of retained proportions were performed to examine the association between cohort retention rate and individual and thematically grouped retention strategies. RESULTS: Results identified 95 retention strategies, broadly classed as either: barrier-reduction, community-building, follow-up/reminder, or tracing strategies. Forty-four of these strategies had not been identified in previous reviews. Meta-regressions indicated that studies using barrier-reduction strategies retained 10% more of their sample (95%CI [0.13 to 1.08]; p = .01); however, studies using follow-up/reminder strategies lost an additional 10% of their sample (95%CI [- 1.19 to - 0.21]; p = .02). The overall number of strategies employed was not associated with retention. CONCLUSIONS: Employing a larger number of retention strategies may not be associated with improved retention in longitudinal cohort studies, contrary to earlier narrative reviews. Results suggest that strategies that aim to reduce participant burden (e.g., flexibility in data collection methods) might be most effective in maximising cohort retention.
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ItemPsychosocial profiles of adolescents from dissolved families: Differences in depressive symptoms in emerging adulthood(ELSEVIER SCIENCE BV, 2018-12-01)BACKGROUND: When parents separate, on average, children are at greater risk for concurrent and subsequent depression; however, mean outcomes mask substantial variation in depressive risk. This study aimed to (1) identify multivariate risk profiles (classes) in adolescents from separated families and (2) prospectively estimate class risk for depressive symptoms in emerging adulthood. METHODS: The sample comprised 449 participants with separated parents from an Australian population based longitudinal cohort study established in 1983. Classes were explored using 17, theoretically germane, self- and parent-reported indicators of adolescent risk assessed at three points in adolescence (13-14, 15-16 and 17-18 years), spanning three domains of assessment: individual, relational, contextual. Distinct profiles of adolescents were identified using Latent Class Analysis. Class differences on depressive symptoms in emerging adult (19-20 years) were then examined. RESULTS: Three multivariate profiles, differentiated by patterns of risk severity, were observed: Adjusted (n = 253), Moderate Risk (n = 156), and High Risk (n = 40). Compared to the Adjusted class, participants in the Moderate Risk, but not High Risk class had notably elevated depressive symptomatology in emerging adulthood (d = 0.35). In contrast, High Risk class membership in adolescence predicted antisocial behavior in emerging adulthood. LIMITATIONS: Risk for depressive symptoms in emerging adulthood may be under-estimated due to a disproportionate loss of participants from low socio-economic backgrounds. CONCLUSIONS: We found most adolescents from dissolved families to be well-adjusted. Differences between Moderate Risk and High Risk adolescents signal differentiated pathways to subsequent mental health problems. Our findings are relevant for targeted therapeutic strategies for adolescents from dissolved families.
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ItemPreconception prediction of expectant fathers' mental health: 20-year cohort study from adolescence(CAMBRIDGE UNIV PRESS, 2018-03)UNLABELLED: We examined prospective associations between men's common mental disorders in the decades prior to offspring conception and subsequent paternal antenatal mental health problems. Data came from a prospective intergenerational cohort study which assessed common mental disorder nine times from age 14 to 29 years, and in the third trimester of subsequent pregnancies to age 35 years (N = 295 pregnancies to 214 men). Men with histories of adolescent and young adult common mental disorders were over four times more likely to experience antenatal mental health problems. Future research identifying modifiable perinatal factors that counteract preconception risk would provide further targets for intervention. DECLARATION OF INTEREST: None.
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ItemPredictors of postnatal mother-infant bonding: the role of antenatal bonding, maternal substance use and mental health(SPRINGER WIEN, 2016-08)The emotional bond that a mother feels towards her baby is critical to social, emotional and cognitive development. Maternal health and wellbeing through pregnancy and antenatal bonding also play a key role in determining bonding postnatally, but the extent to which these relationships may be disrupted by poor mental health or substance use is unclear. This study aimed to examine the extent to which mother-fetal bonding, substance use and mental health through pregnancy predicted postnatal mother-infant bonding at 8 weeks. Participants were 372 women recruited from three metropolitan hospitals in Australia. Data was collected during trimesters one, two and three of pregnancy and 8 weeks postnatal using the Maternal Antenatal Attachment Scale (MAAS), Maternal Postnatal Attachment Scale (MPAS), the Edinburgh Antenatal and Postnatal Depression Scale (EPDS), the Depression and Anxiety Scales (DASS-21), frequency and quantity of substance use (caffeine, alcohol and tobacco) as well as a range of demographic and postnatal information. Higher antenatal bonding predicted higher postnatal bonding at all pregnancy time-points in a fully adjusted regression model. Maternal depressive symptoms in trimesters two and three and stress in trimester two were inversely related to poorer mother-infant bonding 8 weeks postnatally. This study extends previous work on the mother's felt bond to her developing child by drawing on a large sample of women and documenting the pattern of this bond at three time points in pregnancy and at 8 weeks postnatally. Utilising multiple antenatal waves allowed precision in isolating the relationships in pregnancy and at key intervention points. Investigating methods to enhance bonding and intervene in pregnancy is needed. It is also important to assess maternal mental health through pregnancy.
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ItemMaternal Bonding through Pregnancy and Postnatal: Findings from an Australian Longitudinal Study(THIEME MEDICAL PUBL INC, 2017-07)Background Mother-infant bonding provides the foundation for secure attachment through the lifespan and organizes many facets of infant social-emotional development, including later parenting. Aims To describe maternal bonding to offspring across the pregnancy and postnatal periods, and to examine a broad range of sociodemographic and psychosocial predictors of the maternal-offspring bond. Methods Data were drawn from a sample of 372 pregnant women participating in an Australian population-based longitudinal study of postnatal health and development. Participants completed maternal bonding questionnaires at each trimester and 8 weeks postnatal. Data were collected on a range of sociodemographic and psychosocial factors. Results Bonding increased significantly through pregnancy, in quality and intensity. Regression analyses indicated that stronger antenatal bonding at all time points (trimesters 1 through 3) predicted stronger postnatal bonding. Older maternal age, birth mother being born in a non-English speaking country, mother not working full time, being a first-time mother, breast-feeding problems, and baby's crying behavior all predicted poorer bonding at 8 weeks postpartum. Conclusion These novel findings have important implications for pregnant women and their infant offspring, and for health care professionals working in perinatal services. Importantly, interventions to strengthen maternal-fetal bonding would be beneficial during pregnancy to enhance postnatal bonding and infant health outcomes.
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ItemThe natural history of internalizing behaviours from adolescence to emerging adulthood: findings from the Australian Temperament Project(CAMBRIDGE UNIV PRESS, 2016-10)BACKGROUND: The aims of the study were to describe the patterning and persistence of anxiety and depressive symptoms from adolescence to young adulthood and to examine long-term developmental relationships with earlier patterns of internalizing behaviours in childhood. METHOD: We used parallel processes latent growth curve modelling to build trajectories of internalizing from adolescence to adulthood, using seven waves of follow-ups (ages 11-27 years) from 1406 participants of the Australian Temperament Project. We then used latent factors to capture the stability of maternal reported child internalizing symptoms across three waves of early childhood follow-ups (ages 5, 7 and 9 years), and examined relationships among these patterns of symptoms across the three developmental periods, adjusting for gender and socio-economic status. RESULTS: We observed strong continuity in depressive symptoms from adolescence to young adulthood. In contrast, adolescent anxiety was not persistent across the same period, nor was it related to later depressive symptoms. Anxiety was, however, related to non-specific stress in young adulthood, but only moderately so. Although childhood internalizing was related to adolescent and adult profiles, the associations were weak and indirect by adulthood, suggesting that other factors are important in the development of internalizing symptoms. CONCLUSIONS: Once established, adolescent depressive symptoms are not only strongly persistent, but also have the potential to differentiate into anxiety in young adulthood. Relationships with childhood internalizing symptoms are weak, suggesting that early adolescence may be an important period for targeted intervention, but also that further research into the childhood origins of internalizing behaviours is needed.
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ItemAssociations between parent-child relationship quality and obesogenic risk in adolescence: a systematic review of recent literature(WILEY, 2016-07)Adolescence is a period of significant cognitive, social and physiological change, presenting unique risk factors for weight gain. Childhood obesity research has traditionally focused on the influence of parent-level factors on children's eating and weight status. Increasingly, emphasis is turning towards the reciprocal nature of the parent-child relationship and its influence on health behaviour. A systematic literature review was conducted to investigate the relationship between parent-child relationship quality (defined as the felt emotional bond between parent and child) and obesogenic risk (weight status, eating attitudes and behaviours, level of physical activity and sedentary behaviour) in adolescence; 26 papers were included in the review. The results neither support nor challenge an association between parent-child relationship quality and weight, with study design flaws and limited measurement of the parent-child relationship precluding robust conclusions. The review does however suggests that several aspects of the parent-child relationship are important in understanding eating attitudes and behaviours, including the felt emotional bond between the parent and child, the child's perception of how much the parent cares for them and the mother's sensitivity towards the child. The need for further longitudinal research into the association between parent-child relationship quality and obesity risk across this developmental period is discussed.