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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