Missing data in substance abuse research? Researchers' reporting practices of sexual orientation and gender identity.

Background: Lesbian, gay, bisexual, and transgender individuals are at higher risk for substance use and substance use disorders than heterosexual individuals and are more likely to seek substance use treatment, yet sexual orientation and gender identity are frequently not reported in the research literature. The purpose of this study was to identify if sexual orientation and gender identity are being reported in the recent substance use literature, and if this has changed over time.

Method: The PsycINFO and PubMed databases were searched for articles released in 2007 and 2012 using the term "substance abuse" and 200 articles were randomly selected from each time period and database.