Patient Health Questionnaire-9 and 17-item Hamilton Depression Rating Scale for detecting post-stroke depression in cerebral infarction

Table 5 Agreement analysis between two scales and gold standard diagnosis

Scale and cutoff value	Positive cases	True positive	False positive	True negative	False negative	Kappa value	P value
HAMD-17 ≥ 7 points (optimal cutoff value)	146	99	47	186	13	0.632	< 0.001
PHQ-9 ≥ 5 points	175	102	73	160	10	0.521	< 0.001
PHQ-9 ≥ 7 points (optimal cutoff value)	137	93	44	189	19	0.606	< 0.001
PHQ-9 ≥ 10 points	107	82	25	208	30	0.632	< 0.001

HAMD-17: 17-item Hamilton Depression Rating Scale; PHQ-9: Patient Health Questionnaire-9.