Measures used were the Structured Clinical Interview for DSM–IV [23] for depression, the QIDS-SR [28] and the Hamilton Depression Rating Scale [29]. Here, we only report on the results from the QIDS-SR. The 16 items of this scale assess typical depressive symptoms such as sleep disturbance, psychomotor activity and changes in appetite or weight. The QIDS-SR total score ranges from 0 to 27. A score of 0–5 is considered to be within the normal range. In the current study, the Cronbach alpha ranged from 0.68 to 0.87 across assessments.

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