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Table 3 Relationship between PHQ-9 mean scores and depression severity by HAM-D

From: Reliability and validity of the Thai version of the PHQ-9

HAM-D score [22]

N

Mean PHQ-9

SD

95% CI

No depression (0–7)

210

5.42

3.73

4.92–5.93

Mild depression (8–12)

36

8.14

2.98

7.13–9.15

Moderate depression (13–17)

20

10.05

3.87

8.24–11.86

Major depression (18 or greater)

13

14.00

4.93

11.02–16.98