Table 1

Prevalence of current depression by socio-demographic variables and risky sexual behaviours, adults aged 20–59 years, USA, National Health and Nutrition Examination Surveys 2005–2008

	Sample size	Depression prevalence % (SE)	p Value
Overall prevalence in adults aged 20–59 years	5273	7.2 (0.6)
Socio-demographic variables
Sex
Male	2400	5.0 (0.6)	<0.001
Female	2873	9.2 (0.7)	<0.001
Race/ethnicity
Non-Hispanic Caucasian	2565	6.9 (0.8)	0.09
Non-Hispanic African–American	1122	9.6 (1.1)
Mexican–American	994	6.8 (0.9)
Other, including other Hispanic	592	7.7 (1.2)
Age group, years
20–29	1413	5.2 (0.6)	0.01
30–39	1409	7.3 (0.7)
40–49	1339	8.3 (1.2)
50–59	1112	8.0 (0.8)
Marital status
Married	2837	4.9 (0.5)	<0.001
Not married	2432	10.4 (0.9)	<0.001
Poverty index
Below poverty level	983	18.4 (1.5)	<0.001
At or above poverty level	4290	5.7 (0.5)	<0.001
Education
≤High school	2359	10.6 (0.9)	<0.001
More than high school	2914	5.3 (0.5)	<0.001
Risky sexual behaviours
Age at first sex, years
<15	800	14.8 (1.7)	<0.001
≥15	4464	6.1 (0.5)	<0.001
Past year number of sex partners
0	601	11.2 (1.4)	<0.001
1	3678	6.0 (0.5)
2+	907	10.5 (1.2)
Lifetime number of sex partners
1–3	1741	4.9 (0.8)	<0.001
4–9	1678	7.7 (0.7)
10+	1846	8.9 (0.8)