Background and aims Adolescent substance use is a significant public health concern, though the scope of the problem is difficult to ascertain given reliance on self-reported substance use informati...

This Special Communication examines the biases and operational problems of surveys used in psychiatric epidemiological research to develop a standard for using nonprobability and probability-based onl...

Background When analyzing randomized controlled trials (RCTs) data, covariate adjustment is often employed to increase the precision of estimated treatment effects. Missing data in covariates, if not ...