Comparing substance use outcomes by sexual identity among women: Differences using propensity score methods

•Sexual minority women (SMW) evidence more substance use than heterosexual women.•Disparities in substance use were generally evident across nonprobability samples.•Propensity score methods reduced disparities in some, but not all, comparisons.•Panel samples may be a useful option for survey nonprobability sampling of SMW.•Some risks (e.g., substance use to cope with stress) may be highly salient for SMW.