This new grant application, which is based on a 35-year longitudinal study (T1-T7) of substance use, proposes to identify the determinants and barriers to health care services utilization in the fifth decade of life by charting the longitudinal pathways to the utilization of services by adults in early midlife (Aim 1). In addition, the proposed research will assess the long-term consequences of substance use (alcohol, marijuana, and tobacco) in this understudied developmental period (Aim 2). At T8, we will gather information about important areas of physical and psychosocial functioning in adults in early midlife (physical diseases, psychiatric disorders, and functioning in adult roles), and relate these to the histories of substance use. Extensive longitudinal data are available on the participants from previous waves of data collection, including adolescence (T2, T3), emerging adulthood (T4), and young adulthood (T5, T6, and T7). At T8, face-to-face interviews will be conducted with the participants. Psychometrically sound scales will be developed from the surveys. The primary data-analytic techniques will be structural equation modeling, growth mixture modeling and regression. This research will enable us to provide crucial information about factors facilitating and barriers impeding the utilization of health care services among adults transitioning to midlife. In addition the proposed research will provide insight into the cumulative impact of prolonged substance use on psychosocial and physical functioning in adulthood. Since substance abuse and dependence are chronic, relapsing diseases, which may persist throughout a person's life, studying their patterns and concomitants prospectively over the life course is of crucial importance to public health.
The significance of the proposed study lies in its potential to a) identify pathways to the utilization of health care services in adults transitioning to midlife, and b) to determine the association between developmental trajectories of substance use from adolescence to early midlife and physical, psychological, and social functioning in the fifth decade of life. Knowledge to be gained from this research is crucial for understanding supportive factors and barriers to health care service utilization. Studying the patterns and concomitants of substance use prospectively over the life course is also of vital importance to public health and will provide information for the development of interventions which serve the needs of adults in early midlife. Preventing and reducing substance use is an important mission of the National Institute on Drug Abuse.
|Zhang, Chenshu; Brook, Judith S; Leukefeld, Carl G et al. (2018) Season of birth: A predictor of ADHD symptoms in early midlife. Psychiatry Res 267:243-248|
|Zhang, Chenshu; Brook, Judith S; Leukefeld, Carl G et al. (2017) Lack of Preventive Health Behaviors in the Early Forties: The Role of Earlier Trajectories of Cigarette Smoking From Adolescence to Adulthood. Subst Use Misuse 52:1527-1537|
|Zhang, Chenshu; Brook, Judith S; Leukefeld, Carl G et al. (2017) Compulsive buying and quality of life: An estimate of the monetary cost of compulsive buying among adults in early midlife. Psychiatry Res 252:208-214|
|Zhang, Chenshu; Brook, Judith S; Morojele, Neo K et al. (2017) Psychosocial Factors Related to the Intergenerational Transmission of Externalizing Behaviors in Early Midlife. Subst Use Misuse 52:1328-1337|
|Zhang, Chenshu; Brook, Judith S; Leukefeld, Carl G et al. (2016) Longitudinal psychosocial factors related to symptoms of Internet addiction among adults in early midlife. Addict Behav 62:65-72|
|Brook, Judith S; Zhang, Chenshu; Leukefeld, Carl G et al. (2016) Marijuana use from adolescence to adulthood: developmental trajectories and their outcomes. Soc Psychiatry Psychiatr Epidemiol 51:1405-1415|
|Zhang, Chenshu; Brook, Judith S; Leukefeld, Carl G et al. (2016) Trajectories of marijuana use from adolescence to adulthood as predictors of unemployment status in the early forties. Am J Addict 25:203-9|
|Zhang, Chenshu; Brook, Judith S; Leukefeld, Carl G et al. (2016) Psychosocial Factors Related to Underuse of Medical Services. J Urban Health 93:652-65|
|Brook, Judith S; Zhang, Chenshu; Rubenstone, Elizabeth et al. (2016) Comorbid trajectories of substance use as predictors of Antisocial Personality Disorder, Major Depressive Episode, and Generalized Anxiety Disorder. Addict Behav 62:114-21|
|Zhang, Chenshu; Brook, Judith S; Leukefeld, Carl G et al. (2016) Associations between compulsive buying and substance dependence/abuse, major depressive episodes, and generalized anxiety disorder among men and women. J Addict Dis 35:298-304|
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