The validity and reliability of the PHQ-9 on screening of depression in neurology: a cross sectional study

BMC Psychiatry

Table 2 Correlation between items and between each item and the total score

	Item1	Item2	Item3	Item4	Item5	Item6	Item7	Item8	Item9	Total
Item1	1
Item2	0.569^**	1
Item3	0.333^**	0.343^**	1
Item4	0.558^**	0.504^**	0.373^**	1
Item5	0.351^**	0.354^**	0.358^**	0.408^**	1
Item6	0.440^**	0.529^**	0.265^**	0.330^**	0.328^**	1
Item7	0.328^**	0.339^**	0.161^**	0.350^**	0.240^**	0.205^**	1
Item8	0.510^**	0.463^**	0.309^**	0.440^**	0.330^**	0.375^**	0.497^**	1
Item9	0.399^**	0.578^**	0.272^**	0.344^**	0.279^**	0.567^**	0.160^**	0.373^**	1
Total	0.762^**	0.773^**	0.608^**	0.743^**	0.610^**	0.647^**	0.517^**	0.707^**	0.621^**	1

ISSN: 1471-244X