Table 1.

Baseline characteristics of participants included and excluded from the analysis population.^*

Characteristics	Included n=802 (%)	Excluded* n=201 (%)
Sociodemographic factors
Age (years)
15–17	14.6	11.9
18–24	50.6	52.7
25–34	26.1	29.8
35+	8.7	5.5
Race
African-American/Black	42.9	39.3
White	52.4	54.2
Single†,‡	77.1	69.6
Monthly income <$1000	49.1	45.7
Site: Inner city †,§	48.1	59.2
Reproductive health
Never pregnant	52.4	46.3
Ever sexually transmitted infection	34.8	31.8
2–5 lifetime sexual partners	7.9	39.7
Coital debut age 15–17 years	52. 4	53.5
Never vaginal douching	63.8	62.5
Ever smoked	45.8	44.0
Area of ectopy†,‡
None/Small (<0.09 cm2)	34.0	21.6
Medium (0.09–0.48 cm2)	46.1	59.8
Large (>0.48 cm2)	17.2	18.6
Sexual behavior
One current sexual partners	74.3	77.5
5–12 coital acts per month	30.9	37.7
Past contraceptive use
Ever COCs	63.3	65.8
Ever DMPA	14.2	18.4

^*Women with only one ectopy measurement or who were pregnant for entire study participation were excluded.

^†p-value for Mantel-Haenzel chi-square test for general association.

^‡p<0.05.

^§p≤0.01.