Investigating differential protective effects of marriage on substance use by sexual identity status

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

BACKGROUND

Differences in alcohol, tobacco, and other drug (ATOD) use by sexual identity vary across samples of women recruited using different sampling methods. We used propensity score (PS) weighting methods to address two methodological questions: (1) Do disparities between sexual minority women (SMW) and heterosexual women persist when differences in risk and protective factors are similarly distributed between groups, and (2) Does accounting for SMW-specific resiliency factors impact differences between non-probability samples of SMW?

METHODS

Four samples included SMW from a longitudinal study with a nonprobability sample (n = 373), a national general population panel sample (n = 373), and a national LGBTQ-specific panel sample (n = 311), as well as a national probability sample of heterosexual women (n = 446). Between-groups analyses using double-robust PS weighted models estimated differences in ATOD use under hypothetical conditions in which samples have similar risk and protective factors.

RESULTS

After PS weighting, imbalance in confounders between SMW and heterosexual samples was substantially reduced, but not eliminated. In double-robust PS weighted models, SMW samples consistently had significantly greater odds of drug use than heterosexuals, with odds from 8.8 to 5.6 times greater for frequent marijuana use and 4.8-3.2 greater for other drug use. Few differences between SMW samples in ATOD outcomes or other variables remained after PS weighting.

CONCLUSION

Relative to heterosexual women, disparities in marijuana and other drug use among SMW are evident regardless of sampling strategy. The results provide some reassurance about the validity of large nonprobability samples, which remain an important recruitment strategy in research with SMW.

Measuring the impact of legal recognition of same-sex marriage among sexual minority women

Reductions in structural stigma, such as gaining access to legalized same-sex marriage, is associated with positive psychological and physical health outcomes among sexual minority adults. However, these positive outcomes may be less robust among sexual minority women (SMW; e.g., lesbian, bisexual, queer) than sexual minority men and new measures are needed to develop a more nuanced understanding of the impact of affirming policies on the health and well-being of SMW. This study assessed the psychometric properties of measures developed to assess the psychosocial impacts of legalized same-sex marriage on the lives of SMW. Participants (N=446) completed an online survey assessing the psychosocial impact of legalized same-sex marriage in five domains: 1) personal impact, 2) stigma-related concerns, 3) couple impact, 4) LGBTQ community impact, and 5) political/social environment. Psychometric properties of the scales were examined using traditional and Rasch analyses. Personal, concerns, couple, and political/social environment scales demonstrated high internal consistency (α > 0.80), and acceptable levels of reliability even when scales reduced to five items each. The LGBTQ community scale demonstrated adequate internal consistency (α = 0.79) and could only be reduced to 9 items. These scales may be useful in future studies of SMW health and well-being.