Table 1.

Demographic and reproductive characteristics of women who tested positive compared to negative for ≥1 sexually transmitted infection at enrollment.

	Overall (n=8,347)		STI-Positive (n=656)		STI-Negative (n=7,691)		P-value
Characteristic	N	%	N	%	N	%
Age (years)							<0.001
14–17	411	4.9	29	4.4	382	5.0
18–20	1989	23.8	215	32.8	1774	23.1
21–25	2627	31.5	191	29.1	2436	31.7
26–35	2740	32.8	192	29.3	2548	33.1
36–45	580	7.0	29	4.4	551	7.2
Race							<0.001
Black	4210	49.3	533	82.3	3587	46.6
White	3586	43.0	92	14.0	3494	45.4
Other	640	7.7	31	4.7	609	8.0
Marital status							<0.001
Never married	5088	61.0	496	75.6	4592	59.8
Partnered but not married	1704	20.4	107	16.3	1597	20.8
Married	1006	12.1	27	4.1	979	12.7
Separated, divorced, or widowed	543	6.5	26	4.0	517	6.7
Education							<0.001
High school or less	2767	33.2	310	47.3	2457	32.0
Some college	3590	43.0	288	43.9	3302	43.0
College or graduate degree	1987	23.8	58	8.8	1929	25.0
Insurance							<0.001
None	3477	41.9	322	51.1	3145	41.2
Public	1159	14.0	139	21.4	3476	13.3
Private	3655	44.1	179	27.5	1020	45.5
Low socioeconomic statusa	4778	57.2	479	73.0	4299	55.9	<0.001
Parity							<0.001
0	4007	48.0	251	38.3	3756	48.8
1	2050	24.5	203	31.0	1847	24.0
2	1424	17.1	108	16.4	1316	17.1
3 or more	866	10.4	94	14.3	772	10.0
History of unintended pregnancy	5208	62.5	491	75.1	4717	61.4	<0.001
Age at first sex (years)							<0.001
13 or less	604	7.3	71	10.8	533	7.0
14–15	2315	28.1	210	32.1	2105	27.8
16–17	3152	38.3	252	38.5	2900	38.3
18 or older	2161	26.3	122	18.6	2039	26.9
Concurrent partners in past 30 days	469	5.6	84	12.8	385	5.0	<0.001
Lifetime sexual partners							<0.001
1	736	9.0	25	3.9	711	9.4
2–9	4947	60.4	422	65.1	4525	60.0
10–19	1629	19.9	131	20.2	1498	19.9
20–49	755	9.2	55	8.5	700	9.3
50 or more	121	1.5	15	2.3	106	1.4
History of sexually transmitted infectionb	2081	24.9	244	37.2	1837	23.9	<0.001
Douche during the past 30 days	809	9.7	97	15.0	712	9.3	<0.001
History of drug use	1630	19.5	176	26.8	1454	18.9	<0.001
Met CDC age-based screening criteriac	5027	60.2	435	66.3	4592	59.7	<0.001
Met CDC risk-based screening criteriad	1050	12.6	103	15.7	947	12.3	0.012

^aCurrent receipt of food stamps, WIC, welfare or unemployment or has trouble paying for transportation, housing, health or medical care or food

^bSelf-reported history of chlamydia, gonorrhea, syphilis or HIV

^c≤25 years at time of screen

^d≥26 years at time of screen and reports concurrent partners or history of STI or current vaginal discharge