Table 2.

Construct validity: association between PHQ-2, PHQ-9 and WHO quality of life scores (N=926)

Level of depressive symptom severity	PHQ-9 depression		Quality of life by domain
	Mean		Physical Mean score		Psychological Mean score		Social relationships Mean score		Environmental Mean score
0 (n= 272)	1.9		57.9		68.1		72.8		49.5
1 (n=181)	4.2		52.9		58.8		68.3		43.8
2 (n=189)	7.4		48.0		50.7		59.5		38.9
3 (n=106)	9.8		49.0		48.9		58.1		38.4
4 (n=94)	11.7		45.3		45.2		51.5		36.5
5 (n=27)	13.2		45.2		41.5		52.9		34.7
6 (n=57)	15.8		41.9		38.4		47.2		31.3
	r	P-value	r	P-value	r	P-value	r	P-value	r	P-value
Correlation with PHQ-2	0.80	<0.001	−0.35	<0.001	−0.51	<0.001	−0.35	<0.001	−0.34	<0.001