The average number of prescriptions filled in a year was calculated for the following subpopulations of interest: nondisabled adults under age 65 who experienced at least one employment status change and either (1) had ESI and were uninsured at any time during the study period; (2) had ESI and Medicaid separately at any time during the study period; or (3) had ESI and a private healthcare exchange plan separately at any time during the study period. For each subpopulation, the difference between average prescription fills with and without ESI is statistically significant at the 5% level.