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Table 3 Polychoric correlation coefficients (95%CI) between the individual items of the QIDS-SR 16

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

  Sleep Depressed mood Appetite/weight Concentration Self-view Suicidal ideation Interest Energy Psychomotor
Sleep 1         
Depressed mood 0.33 (0.23-0.42) 1        
Appetite/weight 0.19 (0.10-0.29) 0.22 (0.12-0.32) 1       
Concentration 0.33 (0.24-0.41) 0.47 (0.39-0.56) 0.37 (0.28-0.44) 1      
Self-view 0.36 (0.25-0.46) 0.58 (0.52-0.66) 0.29 (0.17-0.42) 0.52 (0.44-0.61) 1     
Suicidal ideation 0.36 (0.26-0.47) 0.59 (0.50-0.68) 0.30 (0.20-0.42) 0.39 (0.28-0.48) 0.61 (0.52-0.69) 1    
Interest 0.38 (0.27-0.48) 0.52 (0.42-0.61) 0.36 (0.26-0.45) 0.52 (0.42-0.61) 0.49 (0.37-0.59) 0.53 (0.42-0.63) 1   
Energy 0.39 (0.30-0.47) 0.44 (0.35-0.54) 0.29 (0.19-0.39) 0.54 (0.47-0.62) 0.42 (0.33-0.52) 0.35 (0.24-0.46) 0.56 (0.47-0.65) 1  
Psychomotor 0.24 (0.12-0.34) 0.46 (0.36-0.56) 0.35 (0.25-0.44) 0.63 (0.56-0.70) 0.52 (0.45-0.60) 0.38 (0.28-0.48) 0.46 (0.35-0.55) 0.47 (0.39-0.55) 1
  1. Abbreviations: QIDS-SR 16 Quick Inventory of Depressive Symptoms 16-item self-report version.