*2.2. Sample*

A total of 628 students (n = 297 MEP; n = 331 non-MEP) were asked to complete a baseline assessment during the first and second year of recruitment. Of those, 508 enrolled (257 MEP and 251 non-MEP) and participated in the baseline assessment for a response proportion of 80.9%. For the follow-up assessments, participants with a baseline assessment who were still enrolled in school were eligible to participate. Of those, greater than 90% participated in the follow-up assessments each year. The available sample size for each study year were as follows: baseline (n = 257 MEP, n = 251 non-MEP), follow-up year 1 (n = 209 MEP, n = 220 non-MEP), follow-up year 2 (n = 165 MEP, n = 181 non-MEP), and follow-up year 3, which only included participants who enrolled during the first recruitment year (n = 65 MEP, n = 65 non-MEP). This study focused on the baseline and follow-up years 1 and 2 only.
