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Background and aims
Low outcome prevalence, often observed with opioid‐related outcomes, poses an underappreciated challenge to accurate predictive modeling. Outcome class imbalance, where non‐events (i.e. negative class observations) outnumber events (i.e. positive class observations) by a moderate to extreme degree, can distort measures of predictive accuracy in misleading ways, and make the overall...
We compare self-reported prevalence of drug use and indicators of data quality from two different response modes (with and without an independent answer sheet for recording responses) in a survey conducted in 2015 among secondary school students.Stratified cluster-randomized study conducted among students in grades 8–12 from public, private and subsidized schools in Chile (N=2317 students in 122 classes)...
Background and aimsThere is a documented link between common psychiatric disorders and substance use in adolescent males. This study addressed two key questions: (1) is there a within‐person association between an increase in psychiatric problems and an increase in substance use among adolescent males and (2) are there sensitive periods during male adolescence when such associations are more evident?...
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