The reliability and validity of PHQ-9 in patients with major depressive disorder in psychiatric hospital

BMC Psychiatry

Table 2 Correlation coefficients showing the correlation between various item scores and between item scores and total scale score of PHQ-9

	Item-1	Item-2	Item-3	Item-4	Item-5	Item-6	Item-7	Item-8	Item-9
Item-1	1.000	–	–	–	–	–	–	–	–
Item-2	0.660^**	1.000	–	–	–	–	–	–	–
Item-3	0.434^**	0.475^**	1.000	–	–	–	–	–	–
Item-4	0.638^**	0.531^**	0.586^**	1.000	–	–	–	–	–
Item-5	0.365^**	0.354^**	0.419^**	0.450^**	1.000	–	–	–	–
Item-6	0.566^**	0.747^**	0.423^**	0.462^**	0.387^**	1.000	–	–	–
Item-7	0.608^**	0.601^**	0.426^**	0.571^**	0.382^**	0.644^**	1.000	–	–
Item-8	0.558^**	0.556^**	0.369^**	0.503^**	0.245^*	0.549^**	0.599^**	1.000	–
Item-9	0.387^**	0.527^**	0.233^*	0.268^**	0.299^**	0.513^**	0.426^**	0.438^**	1.000
Total scores	0.789^**	0.787^**	0.647^**	0.743^**	0.567^**	0.788^**	0.769^**	0.684^**	0.569^**

ISSN: 1471-244X