Controlling for differences between the groups in displacement and velocity abolished the difference in measures of movement smoothness and rmsEMG amplitude.
Relative risk ratio (RRR) was calculated for any CMD, between groups remaining in displacement and returnees, adjusted for socio-demographic factors (gender, age at displacement, marital status, education, food security, financial debt, employment, and social networks).
The differences between groups in peak velocity and acceleration at the M speed conditions were also evident after using displacement as a covariate (p-values < 0.05).
We found no statistically significant differences between groups in the spatial distribution of submovements in either of the two movement halves (both p = 0.91); for the WAD group, 54 ± 17% of the submovements started in the first half of the movement displacement compared to 57 ± 18% in the control group.
Unadjusted RRR for any CMD between the group remaining in displacement and the returnee group was 1.2 (95% CI 0.7 2.1), and remained unchanged when adjusted for socio-demographic factors (1.2; 95% CI 0.6 2.2).
Statistically significant prevalence differences were observed for any CMD, somatoform disorder, major depression, other depression and PTSD between the baseline group and the group remaining in displacement.
Differences between national groups in occupation after displacement were also significant; χ2 = 657.8, p <.000.
Differences between national groups in occupation before displacement were significant; χ2 = 459.5, p <.000.
Overall CMD prevalence had more than halved from 18.8% to 8.6% in the follow-up group remaining in displacement.
