Sex disparities in outcome of medication-assisted therapy of opioid use disorder: Nationally representative outpatient clinic data.

QUESTION: The opioid epidemic causes massive morbidity, and males have substantially greater overdose mortality rates than females. It is unclear whether there are sex-related disparities at different stages in the trajectory of opioid use disorders (OUD), from large samples in the community.

GOAL: To determine sex disparities in non-medical opioid use (NMOU) at the end of treatment with medications for opioid use disorder (MOUD), using national data.

DESIGN

Observational study of outpatient MOUD programs in the "Treatment episode data set-discharges" (TEDS-D) for 2019.

PARTICIPANTS

Persons aged ≥ 18 in their first treatment episode, in outpatient MOUD-based therapy for heroin or other opioids (N = 10,065). The binary outcome was presence/absence of NMOU in the month prior to discharge.

RESULTS

In univariate analyses, males had higher odds of NMOU compared to females (odds ratio=1.22; p = 6.84 ×10-5 after Bonferroni correction). A multivariable logistic regression detected a relatively small male>female odds ratio of 1.14 (p = 0.0039), surviving adjustment for demographic variables and social determinants of health. Several specific conditions were revealed in which males had greater odds of NMOU compared to females (e.g., if they were in the white racial category, and were not of hispanic ethnicity). Also, using by smoking, inhalation or injection routes (versus oral) was associated with greater odds of NMOU, irrespective of sex.

CONCLUSIONS

This national community sample shows that males overall have greater odds of NMOU in their first treatment episode with MOUD, a potential indicator of more unfavorable outcomes. Further analyses should examine the underpinnings of this disparity, including clinical severity features.