Associations between adversity in the family of origin and hair cortisol concentration in adulthood.

The current study examined associations between parental adversities as experienced in adolescence and hair cortisol concentration (HCC) 26 years later (n = 47). Specifically, bivariate correlations and linear regressions were used to examine harsh parenting as well as parental economic pressure, emotional distress, and body mass index (BMI) when their adolescent was between 15 and 16 years old (parent average age 43). HCC was measured when the adolescent was an adult (average 42 years old), at a similar age to when their parent(s) first participated in the study. We also assessed their economic pressure, emotional distress, obesity, and perceived stress in adulthood. For results across generations, parental economic pressure experienced during adolescence was significantly related to HCC when these adolescents were adults. None of the adult economic pressure, emotional distress, BMI, and perceived stress variables were associated with their HCC. Interestingly, there were significant associations among adult perceived stress, economic pressure, emotional distress, and obesity. Thus, the association between parental economic pressure and adult HCC is independent of adult adversities. Results highlight early economic adversity as a possible childhood stressor that has implications throughout the life course.

Father and mother harsh parenting and adult romantic relationships over time: Individual behavior during adolescence.

The present study examined how father and mother harsh parenting as experienced in middle adolescence impacted individual behavior during late adolescence and subsequent harsh couple interaction with their romantic partner in adulthood using a prospective longitudinal design (n = 117 males, 239 females). Data were collected during home visits by a trained interviewer in which family members completed questionnaires and participated in videotaped structured interaction tasks that were coded by trained observers. We assessed the influence of harsh parenting in adolescence (ages 15 and 16, Time 1) on individual processes (e.g., academic difficulty, substance use, and low self-esteem; age 18, Time 2) and harsh couple interaction in adulthood (ages 29 and 31, Time 3; age 34, Time 4). Father harsh parenting was associated with low self-esteem for sons and daughters and substance use for sons. Mother harsh parenting was associated with academic difficulty for adolescents. Academic difficulty and low self-esteem for daughters were further associated with harsh couple interaction at Time 3, while substance use for adolescents was associated with harsh couple interaction at Time 3, which remained stable through established adulthood. We highlight the unique effects of father and mother harsh parenting on later romantic relationship quality through individual mechanisms in late adulthood, for daughters and sons, in the context of the family system. Understanding these nuances as adolescents approach adulthood have implications for programming and policy aimed at strengthening the parent-child relationship in adolescence to allow for the development of healthy romantic relationships later in life. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

The influence of sibling relationship quality on emotional distress from adolescence to early midlife.

This study examines continuity and change in sibling relationship quality (warmth and hostility) from adolescence to adulthood, as well as how changes in sibling relationship quality across developmental stages are associated with early midlife emotional distress. Data come from the Family Transitions Project, a two-decade longitudinal study of youth and their families followed from adolescence to adulthood. The present study included target adolescent self-report data on warmth and hostility toward and received from their sibling over ten data points from ages 15 to 31. Target to sibling warmth decreased from ages 23 to 31, whereas sibling to target warmth increased in emerging adulthood and then decreased into adulthood. Both sibling to target and target to sibling hostility decreased in adolescence and emerging adulthood and then remained low and stable from emerging adulthood to adulthood. Target to sibling warmth at age 23 predicted lower levels of anxiety at age 41. Sibling to target warmth at age 23 also predicted lower levels of depressive symptoms. Target to sibling hostility at age 23 predicted anxiety and hostility in middle adulthood, whereas sibling to target hostility at age 23 predicted anxiety, depressive symptoms, and hostility. In addition, a slower decline in sibling to target hostility from ages 15 to 19 was associated with higher levels of anxiety at age 41. This study is one of the first to examine the quality of sibling relationships across developmental stages and exemplifies how relationship quality between siblings from adolescence to young adulthood can influence emotional distress into early midlife. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

The Role of Resilience in the Impact of Family Economic Adversity on Youth Emotional Distress over Time.

Previous research has highlighted the enduring negative impact of family economic adversity on youth emotional well-being. However, the longitudinal mechanism underlying the link between economic adversity and emotional distress is less explored. The present study examined the longitudinal pathway of parent economic adversity, and parent and adolescent emotional distress at age 16, parental support at age 21, youth self-esteem and mastery at age 23, and adult emotional distress at age 27. Data came from the Family Transitions Project (N = 441, 57% female), a 30-year study of families from the rural Midwest. Structural equation models revealed that economic adversity exerted a long-term negative influence on adult emotional well-being through parent and adolescent emotional distress and youth self-esteem and mastery. Additionally, parental support was associated with adult emotional distress through youth self-esteem and mastery. The current study advances our understanding of youth emotional well-being by suggesting a longitudinal family process and resilience pathways from adolescence to early adulthood.

The intergenerational transmission of economic adversity, BMI, and emotional distress from adolescence to middle adulthood.

The present study examined the intergenerational transmission of economic adversity, as well as physical and mental health across generations. Specifically, we examined the effects of parental economic adversity, body mass index (BMI), and emotional distress during the child's adolescence on their economic adversity, BMI, and emotional distress in middle adulthood. The study included 366 Generation 1 (G1) mothers and fathers and their adolescents (Generation 2; G2) in middle adulthood. G1 behavior was examined when G2 was 16 years old and G2 behavior was assessed at Age 42. In line with aspects of the family stress model, economic hardship was related to economic pressure, which in turn was related to emotional distress for both G1 and G2. For each generation, economic pressure was also associated with BMI. There was also evidence of the intergenerational transmission of economic hardship, BMI, and emotional distress from G1 to G2. Finally, the intergenerational transmission of economic adversity in the family of origin to adult health outcomes was explained by these same health behaviors of the first generation. Results suggest that economic adversity and parental health behaviors as experienced in adolescence have long-term economic and health consequences into middle adulthood. (PsycInfo Database Record (c) 2023 APA, all rights reserved).

Adolescent predictors of psychiatric disorders in adulthood: The role of emotional distress and problem drinking in emerging adulthood.

The current study evaluated risk factors in adolescence on problem drinking and emotional distress in late adolescence and emerging adulthood, and meeting criteria for diagnosed disorders in adulthood. The study included 501 parents and their adolescent who participated from middle adolescence to adulthood. Risk factors in middle adolescence (age 18) included parent alcohol use, adolescent alcohol use, and parent and adolescent emotional distress. In late adolescence (age 18), binge drinking and emotional distress were assessed, and in emerging adulthood (age 25), alcohol problems and emotional distress were examined. Meeting criteria for substance use, behavioral, affective, or anxiety disorders were examined between the ages of 26 and 31. Results showed parent alcohol use predicted substance use disorder through late adolescent binge drinking and emerging adulthood alcohol problems. Behavioral disorders were indirectly predicted by adolescent and emerging adult emotional distress. Affective disorders were indirectly predicted by parent emotional distress through adolescent emotional distress. Finally, anxiety disorders were predicted by parent alcohol use via adolescent drinking; parent emotional distress via adolescent emotional distress, and through adolescent alcohol use and emotional distress. Results provided support for the intergenerational transmission of problem drinking and emotional distress on meeting criteria for diagnosed psychiatric disorders in adulthood.

Life transition events and depressive symptom trajectories during young adulthood: The influence of adverse family and individual contexts in adolescence.

Because sequential patterns of multiple transition events (i.e., college graduation, full-time employment, marriage, and parenthood) are associated with turning points in depressive symptom trajectories during young adulthood, the present study used a sample of 446 White adolescents (52.3% females; 15.58 years old, on average) over 18 years (1992 to 2010) to (a) identify distinct longitudinal joint processes between these sequential patterns of life transition events and turning points of depressive symptom trajectories by using a person-centered modeling approach and (b) investigate the influence of adverse family and individual contexts (negative family economic events, hostile relationships with parents, and impulsive sensation seeking) in adolescence on these longitudinal joint processes. We identified six longitudinal joint processes: (a) traditional transition pattern with no turning points in depressive symptom trajectories, (b) traditional transition pattern with turning points in depressive symptom trajectories in the mid-to-late 20s, (c) early parenthood transition pattern with no turning points in depressive symptom trajectories, (d) early parenthood transition pattern with turning points in depressive symptom trajectories in the mid-to-late 20s, (e) precocious transition pattern with no turning points in depressive symptom trajectories, and (f) precocious transition pattern with depressive symptom turning points (or fluctuations) throughout young adulthood. Negative family economic events, hostile relationships with parents, and impulsive sensation seeking in adolescence influenced these longitudinal joint processes. Hostile relationships with parents also uniquely influenced turning points in depressive symptoms during young adulthood while impulsive sensation seeking uniquely influence sequential patterns of life transition events. Clinical implications are discussed. (PsycInfo Database Record (c) 2023 APA, all rights reserved).

One Line of Sexual Decline? Growth Mixture Modeling for Midlife Sexual Satisfaction.

Most research has shown that sexual satisfaction in long-term relationships tends to decline over time. Studies showing the average trajectory, however, are limited by only assessing one slope. With longitudinal data from the Flourishing Families Project, Marital Instability Dataset, and the Iowa Youth and Families Project, we utilized growth mixture modeling to assess what trajectories of sexual satisfaction exist in midlife marriages. In the three samples (one individual, two dyadic), we found clear evidence for heterogeneous sexual satisfaction trajectories, for both wives and husbands. Through the datasets, we found some trajectories did decline over time. We also found stably high, stably medium, stably low, and some trajectories that showed an increase in sexual satisfaction over time. Overall, trajectories were similar for wives and husbands, though some classes had one partner with variability while the other was stable, some classes had trajectories with wives having higher sexual satisfaction than husbands, and some classes had trajectories with husbands having higher sexual satisfaction than wives. Demographic variables were not strong distinguishers of these differing trajectories. Both marital satisfaction and perceived marital stability trajectories (based on sexual satisfaction classes) generally had similar patterns to sexual satisfaction trajectories, with a few exceptions. Both marital satisfaction and perceived marital stability were less likely to significantly change over time, have discrepancies between wives and husbands, and have either low marital satisfaction or high perceived marital instability, even if sexual satisfaction was low. These data can help couples recognize various possibilities for sexual satisfaction over time, perhaps helping them to avoid cultural myths of inevitably declining sexual satisfaction.

Spirituality and Religious Engagement, Community Involvement, Outness, and Family Support: Influence on LGBT+ Muslim Well-Being.

The current study utilized data from the Social Justice Sexuality Project to investigate influences on psychological well-being of LGBT+ Muslims (N = 75) in the United States. Specifically, path analyses were used to examine the association between spiritual and religious engagement, LGBT community involvement, outness, and family support with psychological well-being. Control variables included lifespan Islam involvement, age, income, and the age at which the participant came out to themselves. Findings illustrate spiritual and religious engagement, outness, and income were all positively related to psychological well-being. Moreover, individuals who had converted to Islam but were not raised in the faith had significantly lower psychological well-being than those who had a consistent experience with Islam from their childhood until the time of the study. The present investigation provides critical contributions to the study of gender and sexual minorities in the United States and the experiences of currently practicing LGBT+ Muslims and those who were raised Muslim. Clinical implications and future research suggestions are discussed.

Special section on personality development: Testing environmental and genetic associations across generations.

This special section focuses on the life-course development of positive and negative personality traits and their consequences. Specifically, we pose four research questions inspired by the special section in Developmental Psychology on Conscientiousness (Reiss, Eccles, & Nielsen, 2014). The current set of articles extends the examination of the positive effects of Conscientiousness on individual well-being by also considering the potentially disruptive effects of specific negative personality traits (alienation and low sense of well-being). Our four questions are as follows. Question 1: what are the correlates of Conscientiousness and negative personality traits in terms of family processes? Question 2: to what degree do Conscientiousness and negative traits operate in a transactional process with the social and economic environment to amplify or suppress these characteristics? Question 3: how do individual personality characteristics affect specific behaviors and interactions within lived-environments to impact later well-being and life outcomes? Question 4: is there evidence that particular genetic characteristics affect connections between personality and its antecedents or consequences? One unique aspect of the present special section is that we address these issues across time utilizing prospective, longitudinal data provided by over 2,400 individual family members participating in the Family Transitions Project (FTP). This introductory article outlines the goals of the special section, and presents the background and development of the FTP, a longitudinal, multigenerational research project which provides the data for the four empirical articles in the special section. (PsycInfo Database Record (c) 2021 APA, all rights reserved).

An examination of genetic and environmental factors related to negative personality traits, educational attainment, and economic success.

Personality variables are associated with educational attainment and socioeconomic outcomes. In this study we incorporated a polygenic score derived from the largest genome-wide association study (GWAS) of educational attainment to date (Lee et al., 2018) into the Interactionist Model of R. D. Conger, Martin, and Masarik (2021) that describes the influence of socioeconomic factors on individual development. The inclusion of a polygenic score predictive of educational attainment (PS-Edu) into this model, and the use of the multigeneration, longitudinal Family Transitions Project (FTP) provide a unique opportunity to investigate genetic and environmental influences on the development of negative personality traits and educational and economic outcomes. The FTP is a three-generation sample. This study utilized data from the first generation (G1; mean age 40 at initiation of the FTP) and second generation (G2; assessed at mean ages 18 and 30). Participants are approximately 50% female, 99% of European ancestry, primarily from lower to middle class SES. PS-Edu was significantly correlated with educational attainment in both generations of the FTP, accounting for 4.1 to 6.7% of the variance. Findings confirm that PS-Edu is a complex genetic index that is correlated with all of the socioeconomic constructs in the model. Results suggest potential gene-environment correlation or common genetic influences underlie associations among parenting investments, negative personality traits, and educational attainment. Genetic variance captured by PS-Edu was mediated substantially through G1 parental investments. Although study limitations warrant cautious interpretation, we demonstrate the promise of including polygenic scores in developmental models to better understand genetic and environmental influences on human development. (PsycInfo Database Record (c) 2021 APA, all rights reserved).

Pathways of the family stress model in midlife on physical health in later adulthood.

The current study examined economic adversity and physical health outcomes in line with the family stress model (FSM) for husbands and wives in enduring marriages. Data came from 243 husbands and wives who participated from early middle to later adulthood. Assessments included observational and self-report measures. Economic hardship and economic pressure were assessed in early middle adulthood. Feelings of hostility and observed harsh couple interaction were examined in middle adulthood, and physical impairment was assessed in later adulthood. Results indicated that economic hardship related to economic pressure. In addition, economic pressure indirectly related to physical impairment via hostility and harsh couple interaction. For husbands, economic pressure was also directly associated with their own physical impairment in later adulthood. Finally, economic pressure was indirectly associated with husband to wife harsh couple interaction through wife hostility. Similarly, economic pressure was indirectly associated with wife to husband harsh couple interaction through husband hostility. Results suggest that economic adversity as experienced in early middle adulthood has long-term health consequences into later adulthood. (PsycInfo Database Record (c) 2021 APA, all rights reserved).

Using item response theory to evaluate the Children's Behavior Questionnaire: Considerations of general functioning and assessment length.

Although the Children's Behavior Questionnaire (CBQ; Rothbart, Ahadi, Hershey, & Fisher, 2001) is the most popular assessment for childhood temperament, its psychometric qualities have yet to be examined using Item Response Theory (IRT) methods. These methods highlight in detail the specific contributions of individual items for measuring different facets of temperament. Importantly, with 16 scales for tapping distinct aspects of child functioning (195 items total), the CBQ's length can be prohibitive in many contexts. The detailed information about item functioning provided by IRT methods is therefore especially useful. The current study used IRT methods to analyze the CBQ's 16 temperament scales and identify potentially redundant items. An abbreviated "IRT form" was generated based on these results and evaluated across four independent validation samples. The IRT form was compared to the original and short CBQ forms (Putnam & Rothbart, 2006). Results provide fine-grained detail on the CBQ's psychometric functioning and suggest it is possible to remove up to 39% of the original form's items while largely preserving the measurement precision and content coverage of each scale. This study provides considerable psychometric information about the CBQ's items and scales and highlights future avenues for creating even more efficient high-quality temperament assessments. (PsycInfo Database Record (c) 2020 APA, all rights reserved).

Reduced Retinal Thickness Predicts Age-Related Changes in Cognitive Function.

Currently, there is a lack of biomarkers to identify individuals in the early stages of Alzheimer's disease (AD). A preponderance of evidence suggests that neurodegenerative processes that affect the brain, may also affect the retina. Using optical coherence tomography (OCT), a non-invasive approach, many have shown thinning of the retina in AD and the developmental precursor to AD, mild cognitive impairment (MCI). However, the relationship between retinal thickness and cognitive function is not entirely clear. This is likely due to the disparity in diagnostic criteria used to determine MCI that does not fully probe the cognitive domains that are particularly vulnerable to aging. This study used a comprehensive neuropsychological assessment involving multiple domains of cognition to determine if retinal thickness correlates with cognitive performance in a normal aged population. In this study, 20 healthy individuals between 60 and 90 years of age were administered neuropsychological assessments probing various domains of cognitive function, and OCT to measure peripapillary retinal nerve fiber layer (RNFL) thickness. We found that RNFL thickness is correlated with neuropsychological performance in multiple cognitive domains (e.g., working memory, psychomotor speed, and executive function). Our work demonstrates a positive correlation between RNFL thickness and several, but not all, domains of cognitive function in a normative aging population. By determining which cognitive domains retinal thickness can predict, this work can help identify individuals at risk or in preclinical stages of AD and other neurodegenerative diseases.

"Sibling relationships in older adulthood: Links with loneliness and well-being": Correction.

Reports an error in "Sibling relationships in older adulthood: Links with loneliness and well-being" by Clare M. Stocker, Megan Gilligan, Eric T. Klopack, Katherine J. Conger, Richard P. Lanthier, Tricia K. Neppl, Catherine Walker O'Neal and K. A. S. Wickrama (Journal of Family Psychology, 2020[Mar], Vol 34[2], 175-185). In the original article, the df value is incorrect in the following sentence in the first paragraph of the Predictors of Individual Differences in Older Adults' Sibling Relationships section of the Results: "The global F-statistic for warmth was significant (F = 16.55, df = 3, 632, p < .001)." The correct value is "df = 3, 601." (The following abstract of the original article appeared in record 2019-46911-001). Researchers have documented associations between family relationships and a variety of well-being outcomes. Yet, sibling relationships, the longest lasting relationships in most people's lives, have received very little research attention beyond young adulthood. The goals of the current study were to: provide descriptive information about sibling relationships in later adulthood, investigate predictors of individual differences in sibling relationship quality, and examine associations among sibling relationship quality, loneliness, and well-being in later adulthood. The sample included 608 older adults (329 men, 279 women) who were 64.6 years old (SD = 4.58) on average. Participants provided self-report data about their relationships and well-being. Results showed that older adults reported high levels of sibling warmth and low levels of sibling conflict and parental favoritism. Sister-sister pairs had warmer sibling relationships than other gender-compositions. Sibling conflict and parental favoritism were positively associated with symptoms of depression, anxiety, hostility, and loneliness. Sibling warmth was negatively associated with loneliness. Loneliness partially mediated the associations between sibling relationship quality and well-being. Results from this study highlight the importance of sibling relationships in older adults' health and well-being. (PsycInfo Database Record (c) 2020 APA, all rights reserved).

Positive parenting, effortful control, and developmental outcomes across early childhood.

The current study evaluated bidirectional associations between mother and father positive parenting and child effortful control. Data were drawn from 220 families when children were 3, 4, 5, and 6 years old. Parenting and effortful control were assessed when the child was 3, 4, and 5 years old. These variables were used to statistically predict child externalizing and school performance assessed when the child was 6 years old. The study used random intercept cross-lagged panel models to evaluate within-person and between-person associations between parenting and effortful control. Results suggest that prior positive parenting was associated with later effortful control, whereas effortful control was not associated with subsequent parenting from ages 3 to 5. Stable between-child differences in effortful control from ages 3 to 5 were associated with school performance at age 6. These stable between-child differences in effortful control were correlated with externalizing at age 3. (PsycINFO Database Record (c) 2020 APA, all rights reserved).

The intergenerational transmission of harsh parenting, substance use, and emotional distress: Impact on the third-generation child.

The current study evaluated the intergenerational transmission of harsh parenting, substance use, and emotional distress across generations and the association with child aggression. The study included 218 Generation 1 (G1) mothers and fathers, their adolescent (Generation 2; G2) who participated from middle adolescence through adulthood, and the 3rd-generation (G3) child between ages 3-5 years and 6-10 years. G1 behavior was examined when G2 was 16 and 18 years old; G2 alcohol problems and marijuana use were assessed when G2 was 19 and 21 years old. G2 emotional distress and harsh parenting were examined when the G3 child was between 3 and 5 years old. Finally, G3 aggression was assessed between 6 and 10 years old. Results showed continuity of G1 behavior when G2 was in adolescence to G2 behavior in adulthood. G1 alcohol problems and G1 harsh parenting were both associated with G3 aggression through G2 alcohol problems, G2 emotional distress, and G2 harsh parenting. Results suggest that G1 problem behavior as experienced by G2 adolescents in the family of origin plays an important role in G2 alcohol problems in emerging adulthood, which leads to G2 emotional distress and G2 harsh parenting in adulthood, which is related to G3 aggression in the early elementary school years. (PsycInfo Database Record (c) 2020 APA, all rights reserved).

Life Course Trajectories of Negative and Positive Marital Experiences and Loneliness in Later Years: Exploring Differential Associations.

Loneliness is relatively common among older adults in the United States, and there can be significant physical, psychological, and cognitive impairments associated with feelings of loneliness. Consequently, this study seeks to uncover determinants of loneliness, particularly the impact of couples' negative and positive marital experiences (i.e., marital strain and strength) over the life course on loneliness in later adulthood. To accomplish this goal, an integrated analytical framework is utilized, incorporating growth curves within an actor-partner interdependence model, to capture the initial level and the rate of change in marital strain and strength over a period of 25 years (from 1991 to 2015) with a sample of 257 couples in enduring, long-term marriages. Couples first participated in the Iowa Youth and Family Project in 1989 and most recently participated in the Later Adulthood Study in 2015. The confirmatory factor analyses showed that latent constructs of marital strain and marital strength are distinct constructs. The univariate growth curve analyses showed that there were significant interindividual variations in the initial level (1991) and rate of change (1991-2015) in marital strain and marital strength for both husbands and wives. While the initial level and rate of change in perceived marital strain from 1991 to 2015 was generally of consequence for both spouses' loneliness in 2015 (actor and partner effects), only actor effects were noted for marital strength. Findings are discussed as they relate to health policies and interventions focusing on the well-being of married couples in later life.

Sibling relationships in older adulthood: Links with loneliness and well-being.

Researchers have documented associations between family relationships and a variety of well-being outcomes. Yet, sibling relationships, the longest lasting relationships in most people's lives, have received very little research attention beyond young adulthood. The goals of the current study were to: provide descriptive information about sibling relationships in later adulthood, investigate predictors of individual differences in sibling relationship quality, and examine associations among sibling relationship quality, loneliness, and well-being in later adulthood. The sample included 608 older adults (329 men, 279 women) who were 64.6 years old (SD = 4.58) on average. Participants provided self-report data about their relationships and well-being. Results showed that older adults reported high levels of sibling warmth and low levels of sibling conflict and parental favoritism. Sister-sister pairs had warmer sibling relationships than other gender-compositions. Sibling conflict and parental favoritism were positively associated with symptoms of depression, anxiety, hostility, and loneliness. Sibling warmth was negatively associated with loneliness. Loneliness partially mediated the associations between sibling relationship quality and well-being. Results from this study highlight the importance of sibling relationships in older adults' health and well-being. (PsycINFO Database Record (c) 2020 APA, all rights reserved).

Patterning of midlife marital trajectories in enduring marriages in a dyadic context: Physical and mental health outcomes in later years.

The current study, using prospective data over 25 years (1991-2015; N = 245 couples), investigates life course dyadic patterns of positive and negative marital trajectories (i.e., marital strength and strain, respectively) in middle-aged husbands and wives and an array of physical and mental health outcomes associated with these patterns. Spousal warmth, spouse's constructive conflict resolution, and couple's joint participation were used as indicators of marital strength, whereas spousal hostility, spouse's destructive conflict resolution, and marital instability were used as indicators of marital strain. Four dyadic latent classes with heterogeneous trajectory patterns were identified using husbands' and wives' concurrent strength and strain marital trajectories (1991-2001), including a couple stable and moderately favorable group, a couple stable and highly favorable group, a couple stable and husband more favorable than wife group, and a husband improving with wife slightly worsening group. The best health outcomes in 2015 were generally reported by members of the couple stable and highly favorable group, whereas the worst health outcomes were found, on average, for members of the husband improving with wife slightly worsening group. Based on these findings, interventions should promote and develop resiliency factors, thereby aiding in the redirection or improvement of middle-aged spouses' marital trajectories, which can reduce detrimental positive-negative imbalances in marital strength and strain.