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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.