Prevalence and correlates of 12-step and second-wave mutual-help attendance in a nationally representative US sample.

Attendance at second-wave MHOs is far less common than 12-step MHOs, but appears to be on the rise. Observed correlates of second-wave MHO attendance should be replicated in larger second-wave MHO samples before integrating these findings into best practices. Enhanced linkages from clinical and criminal justice settings to both second-wave and 12-step groups may help to "broaden the base" of MHOs.