Clarification to Bechtold et al. (2015).

Reports an error in "Chronic adolescent marijuana use as a risk factor for physical and mental health problems in young adult men" by Jordan Bechtold, Theresa Simpson, Helene R. White and Dustin Pardini (Psychology of Addictive Behaviors, 2015[Sep], Vol 29[3], 552-563). For the article, planned analyses using a Wald joint significance test examined whether four adolescent marijuana use trajectory groups differed on self-reported physical and mental health outcomes assessed at age 36. This omnibus test indicated that the groups did not significantly differ in terms of their probability of reporting targeted health problems. The results from this study generated considerable controversy, including requests for supplemental analyses. More details are included. (The following abstract of the original article appeared in record 2015-34684-001.) Some evidence suggests that youth who use marijuana heavily during adolescence may be particularly prone to health problems in later adulthood (e.g., respiratory illnesses, psychotic symptoms). However, relatively few longitudinal studies have prospectively examined the long-term physical and mental health consequences associated with chronic adolescent marijuana use. The present study used data from a longitudinal sample of Black and White young men to determine whether different developmental patterns of marijuana use, assessed annually from early adolescence to the mid-20s, were associated with adverse physical (e.g., asthma, high blood pressure) and mental (e.g., psychosis, anxiety disorders) health outcomes in the mid-30s. Analyses also examined whether chronic marijuana use was more strongly associated with later health problems in Black men relative to White men. Findings from latent class growth curve analysis identified 4 distinct subgroups of marijuana users: early onset chronic users, late increasing users, adolescence-limited users, and low/nonusers. Results indicated that the 4 marijuana use trajectory groups were not significantly different in terms of their physical and mental health problems assessed in the mid-30s. The associations between marijuana group membership and later health problems did not vary significantly by race. Findings are discussed in the context of a larger body of work investigating the potential long-term health consequences of early onset chronic marijuana use, as well as the complications inherent in studying the possible link between marijuana use and health effects.