Percentage of patients with depression. Depression was self-assessed using the validated questionnaires (A) PAID, (B) WHO-5 and (C) ADS-L. Participants who reached a score >39% (PAID), ≤52% (WHO-5) and ≥40 (ADS-L) were diagnosed as depressed. The percentage of patients with depression is given by the checked part of the bar, the white part of the bar gives the percentage of participants without depression. Fisher’s exact test was used to analyze if the numbers of depressed participants differed between groups or points in time (*, p < 0.05).