Sex disparities in outcome of medication-assisted therapy of opioid use disorder: Nationally representative study

QuestionThe 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, in "real world" settings. GoalTo determine sex disparities in non-medical opioid use (NMOU) at the end of outpatient medication-assisted treatment (MAT), using nationally representative data. DesignObservational epidemiological study of publicly funded outpatient MAT programs in the national "Treatment episode data set-discharges" (TEDS-D) for 2019. ParticipantsPersons aged [&ge;]18 in their first treatment episode, in outpatient MAT for use of heroin or other opioids (N=11,549). The binary outcome was presence/absence of NMOU. ResultsIn univariate analyses, males had significantly higher odds of NMOU, compared to females (odds ratio=1.27; Chi2 [df:1]=39.08; uncorrected p<0.0001; p=0.0041 after Bonferroni correction). A multivariable logistic regression detected a male>female odds ratio of 1.19 (95%CI=1.09-1.29; p<0.0001), adjusting for socio-demographic/clinical variables. Several specific conditions were revealed in which males had greater odds of NMOU compared to females (e.g., at ages 18-29 and 30-39; corrected p=0.012, or if they used opioids by inhalation; corrected p=0.0041). ConclusionsThis nationally representative study indicates that males have greater odds of NMOU in their first episode of MAT, indicating more unfavorable outcomes. The study reveals specific socio-demographic and clinical variables under which this sex disparity is most prominent. Highlights*It is unclear if there are sex-related disparities in outcomes for outpatient opioid medication-assisted therapy (MAT), in large-scale "real world" settings. *In this nationally representative "real world" study, adult males had significantly greater odds of non-medical opioid use (NMOU) in the month prior to discharge from their first MAT episode compared to females, adjusting for socio-demographic and clinical variables. Males were at higher risk than females for this undesirable outcome under several conditions (e.g., in younger age categories, or if their route of NMOU was by inhalation. *Sex disparities in MAT outcomes occur under specific conditions that can be examined and potentially addressed, with the goal of improving personalized approaches for OUD.