Table 2. Changes in PHQ-9 Scores Over Time^†.

Group	Baseline		First Follow-up			Second Follow-up			Final Follow-up
	No.	Median	No.	Median	Significance*	No.	Median	Significance*	No.‡	Median	Significance*
Intervention	38	12.5	33	8	P<.001	29	6	P<.001	33	6	P<.001
Control	32	14	27	8	P=.003	25	9	P=.004	28	10	P<.001
Significance**		.31		.25			.03			.04.

^*Significance of difference between baseline and follow-up scores, by Wilcoxon's signed-rank test.

^**Significance of difference in scores between intervention and control group, by 1-tailed Mann-Whitney test.

^†PHQ-9 scores can range from 0 to 27. Scores of 5, 10, 15, and 20 represent mild, moderate, moderately severe, and severe depression, respectively.

^‡The number of subjects is higher for the final follow-up than for earlier follow-ups because some subjects missed earlier follow-up visits but were present for the final follow-up.

No., number of subjects; NS, not significant; PHQ-9, Patient Health Questionnaire (depression assessment instrument).