Table 1.

Demographic characteristics of study sample, National Study of American Lives (NSAL) 2001–2003

	Total (N = 3434)		DSM-IV MDD (lifetime)		No DSM-IV MDD (lifetime)
Characteristics	Sample size	Weighted %	Sample size	Weighted %	Sample size	Weighted %
Family structure
Raised by both biological parents	1810	54.49	165	47.13	1645	55.35
Raised by one biological parent and non-biological parent	689	19.93	89	25.62	600	19.27
Raised by one biological parent	499	13.42	57	14.36	442	13.31
Raised by neither biological parent	353	9.89	44	10.13	309	9.86
Missing	83	2.27	13	2.76	70	2.21	F(4) = 2.05
Age, y
≤ 25	474	16.48	54	19.18	420	16.17
25–39	1131	30.92	132	32.43	999	30.74
40–64	1407	41.42	165	43.96	1242	41.13
≥65	422	11.18	17	4.44	405	11.96	F(3) = 8.36***
Sex
Female	2217	56.00	282	70.25	1131	54.34
Male	1217	44.0	86	29.75	1935	45.66	F(1) = 44.85***
Marital status
Married or cohabiting	1182	41.77	102	32.67	1080	42.82
Formerly married	1113	26.51	125	30.88	988	26.00
Never married	1139	31.73	141	36.45	998	31.18	F(2) = 5.28**
Educational attainment
< 12 years	885	24.11	106	25.95	779	23.90
12 years	1299	37.63	129	33.06	1170	38.16
13–15 years	785	23.97	74	24.56	711	23.90
≥ 16 years	465	14.29	59	16.43	406	14.04	F(3) = 1.25
Income to needs ratio
Poor (<1.0)	900	23.82	121	27.22	779	23.42
Near poor (1.0–1.9)	892	24.06	82	20.84	810	24.43
Non-poor (2.0–3.9)	1029	31.90	107	33.60	922	31.70
Non-poor (≥ 4.0)	613	20.22	58	18.34	555	20.44	F(3) = 1.31

Sample size numbers reflect actual number of respondents; all percentages are weighted and incorporate sampling weights.

F-statistic results reflect design-based effects.

^*p < 0.05

^**p < 0.01

^***p < 0.001