Table 5. Mean scores and prevalence of major depressive symptoms.

*: P<0.05, significant difference between two groups.

			Prevalence [95% confidence intervals]
			MDI Score (CI)				DSM-IV % [CI]
		Mean MDI Score (CI)	MDI Score ≥ 20	Mild	Moderate	Severe	Symptoms of Major Depression
				(20–24)	(25–29)	(30 or more)
All (n=1496)		7.3 [6.9, 7.6]	8.7% [7.3, 10.2]	4.3% [3.3, 5.4]	2.5% [1.7, 3.4]	1.9% [1.3, 2.8]	3.6% [2.7, 4.7]
Females (n=723)		7.8 * [7.2, 8.3]	10.8% * [8.6, 13.3]	5.0% [3.5, 6.8]	2.9% [1.8, 4.4]	2.9%* [1.8, 4.4]	4.4% [3.0, 6.2]
Males (n=773)		6.8 * [6.3, 7,2]	6.7% * [5.1, 8.7]	3.6% [2.4, 5.2]	2.1% [1.2, 3.3]	1.0% * [0.4, 2.0]	2.8% [1.8, 4.3]
Age 13–14 (n=351)	Both (351)	5.4 [4.8, 6.1]	6.0% [3.7, 9.0]	3.4% [1.8, 6.0]	0.8% [0.2, 2.5]	1.7% [0.6, 3.7]	2.6% [1.2, 4.8]
	Females (164)	5.9 [4.9, 7.2]	9.1% * [4.7, 13.6]	5.5% * [2.5, 10.2]	1.2% [0.1, 4.3]	2.4% [0.7, 6.1]	4.3% [1.7, 8.6]
	Males (187)	5.0 [4.2, 5.8]	3.2% * [0.7, 5.7]	1.6% * [0.3, 4.6]	0.5% [0, 3.0]	1.1% [0.1, 3.8]	1.1% [0.1, 3.8]
Age 15–19 (n=689)	Both (689)	7.5 [7.0, 8.0]	8.9% [6.8,11.2]	4.9% [3.4, 6.8]	2.2% [1.2, 3.6]	1.7% [0.9, 3.0]	3.0% [1.9, 4.6]
	Females (330)	7.8 [7.1, 8.6]	10.3% [7.0, 13.6]	4.8% [2.8, 7.8]	2.4% [1.1, 4.7]	3.0% * [1.5, 5.5]	3.3% [1.7, 5.9]
	Males (359)	7.2 [6.6, 7.9]	7.5% [4.8, 10.2]	5.0% [3.0, 7.8]	1.9% [0.8, 4.0]	0.6% * [0.1, 2.0]	2.8% [1.3, 5.1]
Age 20–24 (n-456)	Both (456)	8.4 [7.8, 9.1]	10.5% [7.9, 13.7]	3.9% [2.4, 6.2]	4.2% [2.5, 6.4]	2.4% [1.2, 4.3]	5.3% [3.4, 7.7]
	Females (229)	9.2 * [8.2, 10.2]	12.7% [8.4, 17.0]	4.8% [2.4, 8.4]	4.8% [2.4, 8.4]	3.1% [1.2, 6.2]	6.1% [3.4, 10.0]
	Males (227)	7.7 * [6.9, 8.6]	8.4% [4.8, 12.0]	3.1% [1.2, 6.3]	3.5% [1.5, 6.8]	1.8% [0.5, 4.5]	4.4% [2.1, 8.0]