Age group (years) | | | | 0.008 |
16–24 | 77 (55) | 7 (7) | 6.52 (1.86 to 22.82) | |
25–34 | 48 (34) | 57 (54) | 1 | |
⩾35 | 15 (11) | 41 (39) | 1.28 (0.41 to 4.01) | |
| | | | |
Age at first sexual intercourse | | | | 0.013 |
<15 | 24 (17) | 6 (6) | 0.91 (0.20 to 4.11) | |
15–19 | 113 (81) | 84 (80) | 1 | |
⩾20 | 3 (2) | 15 (14) | 0.04 (0.003 to 0.58) | |
| | | | |
Lifetime sexual partners | | | | 0.7553 |
1–4 | 70 (50) | 69 (66) | 1 | |
⩾5 | 70 (50) | 36 (34) | 0.86 (0.33 to 2.23) | |
| | | | |
Ethnicity | | | | 0.0297 |
White | 125 (89) | 104 (99) | 1 | |
Other | 15 (11) | 1 (1) | 15.30 (0.73 to 318.87) | |
| | | | |
Socioeconomic status* | | | | 0.8663 |
1 | 22 (16) | 8 (8) | 1 | |
2 | 18 (13) | 18 (17) | 0.58 (0.09 to 3.74) | |
3 | 53 (38) | 48 (46) | 0.67 (0.13 to 3.39) | |
4 | 7 (5) | 16 (15) | 0.57 (0.08 to 4.13) | |
5 | 40 (28) | 15 (14) | 0.27 (0.06 to 2.39) | |
| | | | |
Children | | | | <0.001 |
Yes | 68 (49) | 101 (96) | 0.05 (0.01 to 0.25) | |
No | 72 (51) | 4 (4) | 1 | |
| | | | |
Contraception | | | | 0.14 |
Condom (1) | 42 (30) | 36 (34) | 1 | |
Oral (2) | 40 (29) | 26 (25) | 2.54 (0.78 to 8.24) | |
Other† (3) | 34 (24) | 19 (18) | 3.63 (1.11 to 11.87) | |
None (4) | 24 (17) | 24 (23) | 1.64 (0.43 to 6.16) | |
| | | | |
Marital status | | | | 0.172 |
Married (1) | 11 (8) | 43 (41) | 1 | |
Cohabiting (2) | 31 (22) | 27 (26) | 2.37 (0.63 to 8.97) | |
Widowed/separated/divorce (3) | 18 (13) | 13 (12) | 3.85 (0.90 to 16.55) | |
Single (4) | 80 (57) | 22 (21) | 3.69 (0.98 to 13.90) | |
Smoker | | | | 0.503 |
Yes | 86 (61) | 58 (55) | 1.38 (0.54 to 3.52) | |
No | 54 (39) | 47 (45) | 1 | |
| | | | |
Termination of pregnancy | | | | 0.323 |
Yes | 41 (29) | 40 (38) | 0.63 (0.25 to 1.59) | |
No | 99 (71) | 65 (62) | 1 | |
| | | | |
Adverse pregnancy outcome‡ | | | | 0.711 |
Yes | 26 (19) | 31 (30) | 0.83 (0.30 to 2.28) | |
No | 114 (81) | 74 (70) | 1 | |
| | | | |
History of an STI | | | | <0.001 |
Yes | 82 (59) | 11 (10) | 10.14 (3.52 to 29.17) | |
No | 58 (41) | 94 (90) | 1 | |
| | | | |
Exposure to C trachomatis§ | | | | 0.02 |
Yes | 42 (30) | 8 (8) | 5.17 (1.19 to 22.51) | |
No | 98 (70) | 97 (92) | 1 | |