Table 3.

Frequency of Chlamydia trachomatis according to sexual and obstetric history

Age at sexual debut (years)
< 15	299	84.0	57	16.0	1	356	0.875
16–19	622	84.6	113	15.4	0.95 (0.7–1.3)	735
> 19	298	85.4	51	14.6	0.90 (0.6–1.3)	349
Number of Lifetime Partners
1–4	1022	85.3	176	14.7	1	1198	0.015
5–10	195	82.3	42	17.7	1.25 (0.9–1.8)	237
> 10	12	60.0	8	40.0	3.87 (1.56–9.61)	20
Number of Partners in the Past Year
0–1	1160	84.7	209	15.3	1	1369	0.709
2–4	75	81.5	17	18.5	1.26 (0.7–2.2)	92
> 4	5	83.3	1	16.7	1.11 (0.1–9.5)	6
Parity
0	230	85.2	40	14.8	1	270	0.804
1–2	543	85.0	96	15.0	1.02 (0.7–1.5)	639
> 2	443	83.7	86	16.3	1.12 (0.7–1.7)	529
Prior STD
No	999	85.5	170	14.5	1	1169	0.083
Yes	130	80.2	32	19.8	1.45 (0.9–2.2)	162