The respondents who participated in both the baseline and
follow-up survey were statistically significantly older (mean age,
47.9 years; SD, 9.2) than those who participated only in the baseline
survey (mean age, 44.4 years; SD, 12.2). No statistically significant
relationship was found between having MSDs in any bodily region
at baseline and responding at follow-up [odds ratio 1.11 (0.89e
1.39)