The process begins with a baseline questionnaire sent to 149 employees. This leads to 56 baseline respondents, with a response rate of 38 per cent, while 93 employees become non-respondents. Next, a follow-up questionnaire is sent to 184 employees. This leads to 93 follow-up respondents, with a response rate of 51 per cent, while 91 employees become non-respondents at follow-up. The final stage includes 36 respondents, while 20 participants become drop-outs after baseline.
Questionnaire response rates at baseline, 8- and 21-month follow-up and respondent inclusion in this study