We used participants’ self-reported highest level of education (EDU). Participants responded to the question “What is the highest grade in school you completed?” Scores were converted to the number of years typically required to complete that level of education and ranged from 0 to 17 years (primary or secondary school = actual year; technical school/ 1 year college = 13 years; 2 years college = 14 years; 3 years college = 15 years; 4 years college = 16 years; any graduate degree = 17 years).
