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Table 2 Mean scores on individual items of the QIDS-SR 16 (N = 621)

From: Psychometric properties of the self-report version of the Quick Inventory of Depressive Symptoms (QIDS-SR16) questionnaire in patients with schizophrenia

QIDS-SR16items Mean SD
1 Sleep onset insomnia 0.93 1.09
2 Mid-nocturnal insomnia 0.76 0.99
3 Early morning insomnia 0.41 0.86
4 Hypersomnia (excessive sleep) 1.03 0.92
5 Feeling depressed 0.65 0.76
6 Decreased appetite 0.20 0.50
7 Increased appetite 0.35 0.69
8 Weight reduction 0.39 0.79
9 Weight gain 0.36 0.77
10 Concentration/decision making 0.64 0.81
11 Self-view 0.69 1.09
12 Suicide ideation 0.32 0.68
13 General interest 0.40 0.75
14 Energy level 0.55 0.77
15 Feeling slowed down 0.35 0.72
16 Feeling restless 0.49 0.82
  1. Abbreviations: SD Standard Deviation.