Table 1 Baseline Characteristics of the Study Population in the NHANES 2005–2010 and NHANES 2011-2016^a.

Characteristic	2005–2010	2011–2016	P value^e
Number	6651	6378
Weighted (N)	255,577,321	266,344,573
Gender			> 0.05
Male	49.9	50.0
Female	50.1	50.0
Age, y			> 0.05
18–29	54.7	55.5
30–39	45.3	44.5
Race/ethnicity			> 0.05
Mexican American	12.4	12.7
Other Hispanic	6.2	8.1
Non-Hispanic White	61.3	56.3
Non-Hispanic Black	13.2	12.9
Other^b	6.9	10.1
Education			< 0.05
< High school	17.9	13.8
High school	22.7	19.8
> High school	59.4	66.4
Marital status
Never married	35.8	37.8
Widowed/divorced/separated	6.9	6.3
Married/living with partner	57.3	55.9
Family poverty ratio			< 0.05
< 100%	18.9	22.4
≥ 100%	81.1	77.6
Age at first sex^c, y
< 18	64.9	63.0
≥ 18	35.1	37.0
Lifetime no. sexual partners			< 0.05
0	3.3	8.2
1	13.6	15.6
2–5	32.4	31.6
> 5	50.8	44.7
Past STI diagnosis^d			> 0.05
Yes	9.2	7.8
No	90.8	92.2

Data were expressed as %. NHANES National Health and Nutrition Examination Survey, STI sexually transmitted infection.
^aAll estimates were weighted to be nationally representative. No. of participants for some variables may not sum up to equal the unweighted and weighted number due to missing data.
^b“Other” includes race and ethnicity other than non-Hispanic White, non-Hispanic Black, and Hispanic, including multiracial.
^cDefined as vaginal, oral, or anal.
^dParticipants who have been told by a doctor or other health care professional in the last 12 months that they had chlamydia or gonorrhea or have ever been told they have herpes or genital warts.
^eWilcoxon rank-sum test for complex survey samples.

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