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Table 1 Patient characteristics (N = 621)

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

  Mean (SD; range) or N (%)
Age 30.1 (7.3; 18–59)
Male (%) 478 (77%)
Education  
Primary school 39 (6%)
Secondary school/high school 322 (52%)
Vocational education 150 (24%)
Vocational higher education 65 (11%)
University 45 (7%)
Illness duration (years) 7.3 (4.1; 2.0-43.1)
Age of onset first psychosis (years) 22.3 (6.7; 5–51)
Primary diagnosis  
Schizophrenia 398 (64%)
Schizoaffective disorder 80 (13%)
Schizophreniform disorder 37 (6%)
Delusional disorder 14 (2%)
Brief psychotic disorder 13 (2%)
Psychotic disorder NOS 64 (10%)
Other psychotic disorder 15 (2%)
Antidepressantsa 81 (17%)
Antipsychoticsa  
No antipsychotics 67 (14%)
Risperidone 58 (12%)
Olanzapine 91 (19%)
Quetiapine 28 (6%)
Clozapine 71 (15%)
Haloperidol 16 (3%)
Aripiprazol 50 (10%)
Other antipsychotics 35 (7%)
Combination therapy 65 (14%)
QIDS-SR16 (total) 6.6 (4.9; 0–26)
CDSS (total) 2.0 (2.8; 1–16)
PANSS Total 61.8 (18.9; 41–148)
PANSS-EMO (emotional distress) 13.1 (4.8; 8–33)
PANSS-NEG (negative symptoms) 12.6 (5.4; 4–41)
PANSS-POS (positive symptoms) 11.3 (5.4; 3–39)
PANSS-DIS (disorganized symptoms) 14.2 (5.1; 10–46)
PANSS-EXC (excitement symptoms) 10.6 (3.2; 2–29)
AIMS (total) 0.1 (0.2; 0–1.9)
BARS (total) 0.3 (0.6; 0–4.0)
UPDRS (subtotal motor symptoms)b 0.2 (0.1; 0–1.4)
  1. Abbreviations: SD Standard Deviation; QIDS-SR 16 Quick Inventory of Depressive Symptomatology 16-item self-report version; CDSS Calgary Depression Scale for Schizophrenia; PANSS Positive and Negative Syndrome Scale; AIMS Abnormal Involuntary Movement Scale; BARS Barnes Akathisia Rating Scale and UPDRS Unified Parkinson’s Disease Rating Scale.
  2. a Data on medication was available for n = 481 (77%) patients.
  3. b UPDRS ratings were available for n = 531 (85%) patients.