Table 2.

The PHQ-9 item and scale descriptives.

	Patient Health Questionnaire 9 items (PHQ-9) Adolescent version		Item M (SD)
			Total (N = 846)	Boys (n = 387)	Girls (n = 459)
1.	Feeling down, depressed, irritable, or hopeless		0.69 (0.76)	0.42 (0.61)	0.92 (0.80)
2.	Little interest or pleasure in doing things		0.90 (0.79)	0.79 (0.78)	1.00 (0.79)
3.	Trouble falling asleep, staying asleep, or sleeping too much		1.00 (0.98)	0.82 (0.93)	1.15 (0.99)
4.	Poor appetite, weight loss, or overeating		0.35 (0.70)	0.23 (0.59)	0.43 (0.77)
5.	Feeling tired, or having little energy		1.05 (0.86)	0.87 (0.80)	1.20 (0.88)
6.	Feeling bad about yourself, or that you're a failure or that you've let yourself or your family down		0.66 (0.85)	0.43 (0.69)	0.86 (0.92)
7.	Trouble concentrating on things like school work, reading, or watching TV		0.71 (0.81)	0.63 (0.79)	0.78 (0.82)
8.	Moving or speaking so slowly that other people could have noticed		0.21 (0.52)	0.20 (0.50)	0.21 (0.54)
9.	Thought that you would be better off dead, or of hurting yourself in some way		0.23 (0.61)	0.17 (0.52)	0.28 (0.67)
			Scale Descriptives
	PHQ-9 overall scores	M (SD)	5.83 (4.78)	4.57 (3.98)	6.89 (5.13)
		Range	0–27	0–24	0–27
		Skewness (s.e.)	1.48 (0.08)	1.55 (0.12)	1.35 (0.11)
		Kurtosis (s.e.)	2.86 (0.17)	3.69 (0.25)	2.16 (0.23)

Response options: 0, “not at all”; 1, “some days”; 2, “more than half the days”; 3, “nearly every day.”