Baseline characteristics of respondents to the first surveya, respondents to the first and second surveysb, and drop-outs from the first to the second survey.

aRespondents were defined as having completed the HSCL-10, minimum one predictor at the first survey, and having information on department affiliation.bRespondents were defined as having completed the HSCL-10 at both the first and second surveys, minimum one predictor at the first survey, and having information on department affiliation at the first survey.cSeparate univariable logistic regression analyses to estimate non-response and attrition.*p