Survey Administration

HMP enrollees selected for the survey sample were mailed an introductory packet from the University of Michigan containing a letter and brochure describing the project, and a postage-paid postcard that could be optionally mailed to indicate their preferred time/day for the survey. Study team members called sampled HMP enrollees on weekdays 9 a.m.–9 p.m. or at enrollees’ requested time. Surveys were conducted with a computer-assisted telephone interviewing (CATI) system in English, Arabic, and Spanish and lasted approximately one hour. A thank you letter and $25 gift card were mailed to each participant after the survey.