Table 3.

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

	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

Abbreviations: QIDS-SR ₁₆ Quick Inventory of Depressive Symptoms 16-item self-report version.