Characteristic | Girls | Boys | Both | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
N | (%) | nCT | (%) | OR | 95% CI | p 1 | N | (%) | nCT | (%) | OR | 95% CI | p 1 | OR | 95% CI | p 1 | |
Sexual behaviour | |||||||||||||||||
Age at first intercourse | |||||||||||||||||
≥ 15 years | 330 | (58.8) | 24 | (7.3) | 1.00 | 0.97 | 294 | (65.9) | 8 | (2.7) | 1.00 | 0.10 | 1.00 | 0.27 | |||
≤ 14 years | 231 | (41.2) | 17 | (7.4) | 1.01 | 0.53 to 1.93 | 152 | (34.1) | 9 | (5.9) | 2.25 | 0.85 to 5.96 | 1.35 | 0.79 to 2.30 | |||
Years sexually active | |||||||||||||||||
≤ 1 year | 149 | (26.6) | 10 | (6.7) | 1.00 | 0.74 | 158 | (35.4) | 2 | (1.3) | 1.00 | 0.055 | 1.00 | 0.099 | |||
≥ 2 years | 412 | (73.4) | 31 | (7.5) | 1.13 | 0.54 to 2.37 | 288 | (64.6) | 15 | (5.2) | 4.29 | 0.97 to 18.99 | 1.73 | 0.90 to 3.31 | |||
Condom use first intercourse | |||||||||||||||||
No2 | 223 | (39.6) | 14 | (6.3) | 1.00 | 0.46 | 206 | (45.3) | 16 | (7.8) | 1.00 | 0.003 | 1.00 | 0.13 | |||
Yes | 340 | (60.4) | 27 | (7.9) | 1.29 | 0.66 to 2.51 | 249 | (54.7) | 1 | (0.4) | 0.05 | 0.01 to 0.36 | 0.75 | 0.39 to 1.13 | |||
Currently in a relationship | |||||||||||||||||
Yes | 296 | (52.4) | 19 | (6.4) | 1.00 | 0.42 | 167 | (35.8) | 6 | (3.6) | 1.00 | 0.82 | 1.00 | 0.69 | |||
No | 269 | (47.6) | 22 | (8.2) | 1.30 | 0.69 to 2.46 | 299 | (64.2) | 12 | (4.0) | 1.12 | 0.41 to 3.05 | 1.12 | 0.66 to 1.90 | |||
Sex partners past 6 months | |||||||||||||||||
0-1 | 323 | (57.9) | 12 | (3.7) | 1.00 | <0.001 | 254 | (58.8) | 6 | (2.4) | 1.00 | 0.053 | 1.00 | <0.001 | |||
≥ 2 | 235 | (42.1) | 29 | (12.3) | 3.65 | 1.82 to 7.31 | 178 | (41.2) | 11 | (6.2) | 2.72 | 0.99 to 7.50 | 3.33 | 1.88 to 5.90 | |||
Lifetime no of sex partners | |||||||||||||||||
1-2 | 192 | (34.5) | 6 | (3.1) | 1.00 | 0.002 | 203 | (47.8) | 4 | (2.0) | 1.00 | 0.24 | 1.00 | <0.001 | |||
3-5 | 178 | (32.0) | 11 | (6.2) | 2.04 | 0.74 to 5.64 | 117 | (27.5) | 4 | (3.4) | 1.76 | 0.43 to 7.18 | 2.06 | 0.91 to 4.66 | |||
≥ 6 | 186 | (33.5) | 24 | (12.9) | 4.59 | 1.83 to 11.51 | 105 | (24.7) | 6 | (5.7) | 3.02 | 0.83 to 10.93 | 4.43 | 2.13 to 9.21 | |||
Last sexual partner | |||||||||||||||||
Age difference | |||||||||||||||||
Same age or younger | 133 | (24.3) | 7 | (5.3) | 1.00 | 0.30 | 381 | (88.0) | 11 | (2.9) | 1.00 | 0.005 | 1.00 | 0.002 | |||
Older (≥ 1 year) | 414 | (75.7) | 33 | (8.0) | 1.56 | 0.67 to 3.61 | 52 | (12.0) | 6 | (11.5) | 4.39 | 1.55 to 12.42 | 2.52 | 1.42 to 4.47 | |||
How met last partner | |||||||||||||||||
At school/work | 66 | (11.7) | 2 | (3.0) | 1.00 | 0.008 | 104 | (23.0) | 2 | (1.9) | 1.00 | 0.65 | 1.00 | 0.008 | |||
Through family/friends/other | 312 | (55.4) | 16 | (5.1) | 1.73 | 0.39 to 7.71 | 187 | (41.4) | 4 | (4.2) | 1.98 | 0.40 to 9.73 | 2.01 | 0.68 to 5.89 | |||
On the Internet | 58 | (10.3) | 5 | (8.6) | 3.02 | 0.56 to 16.19 | 47 | (10.4) | 2 | (4.3) | 2.27 | 0.31 to 16.60 | 2.96 | 0.85 to 10.38 | |||
At a private party, bar, disco | 127 | (22.6) | 18 | (14.2) | 5.28 | 1.19 to 23.52 | 114 | (25.2) | 6 | (5.3) | 2.83 | 0.56 to 14.36 | 4.59 | 1.56 to 13.48 | |||
Type of relationship | |||||||||||||||||
Regular partner/sweetheart | 324 | (57.4) | 20 | (6.2) | 1.00 | 0.31 | 209 | (46.3) | 5 | (2.4) | 1.00 | 0.090 | 1.00 | 0.51 | |||
Ex partner/sweetheart | 74 | (13.1) | 8 | (10.8) | 1.84 | 0.78 to 4.36 | 51 | (11.3) | 1 | (2.0) | 0.82 | 0.093 to 7.14 | 1.58 | 0.72 to 3.47 | |||
A friend I have sex with | 103 | (18.3) | 6 | (5.8) | 0.94 | 0.37 to 2.41 | 95 | (21.1) | 8 | (8.4) | 3.75 | 1.19 to 11.79 | 1.55 | 0.79 to 3.04 | |||
Casual contact/other | 63 | (11.2) | 7 | (11.1) | 1.91 | 0.77 to 4.71 | 96 | (21.3) | 3 | (3.1) | 1.32 | 0.31 to 5.62 | 1.36 | 0.64 to 2.90 | |||
Last sexual intercourse | |||||||||||||||||
Condom use | |||||||||||||||||
No3 | 474 | (84.0) | 39 | (8.2) | 1.00 | 0.062 | 300 | (66.5) | 16 | (5.3) | 1.00 | 0.039 | 1.00 | 0.003 | |||
Yes | 90 | (16.0) | 2 | (2.2) | 0.25 | 0.06 to 1.07 | 151 | (33.5) | 1 | (0.7) | 0.12 | 0.02 to 0.90 | 0.17 | 0.05 to 0.53 | |||
Related alcohol/drug use | |||||||||||||||||
No | 460 | (81.7) | 30 | (6.5) | 1.00 | 0.15 | 343 | (76.2) | 11 | (3.2) | 1.00 | 0.26 | 1.00 | 0.10 | |||
Yes | 103 | (18.3) | 11 | (10.7) | 1.71 | 0.83 to 3.54 | 107 | (23.8) | 6 | (5.6) | 1.79 | 0.65 to 4.97 | 1.64 | 0.91 to 2.94 | |||
Chlamydia infection | |||||||||||||||||
Test prior to study | |||||||||||||||||
No | 251 | (45.5) | 18 | (7.2) | 1.00 | 0.94 | 368 | (79.1) | 11 | (3.0) | 1.00 | 0.14 | 1.00 | 0.11 | |||
Yes | 313 | (55.5) | 23 | (7.3) | 1.03 | 0.54 to 1.95 | 97 | (20.9) | 6 | (6.2) | 2.14 | 0.77 to 5.94 | 1.55 | 0.91 to 2.63 | |||
Treatment for infection | |||||||||||||||||
No | 452 | (80.1) | 30 | (6.6) | 1.00 | 0.25 | 433 | (93.3) | 16 | (3.7) | 1.00 | 0.87 | 1.00 | 0.13 | |||
Yes | 112 | (19.9) | 11 | (9.8) | 1.53 | 0.74 to 3.16 | 31 | (6.7) | 1 | (3.2) | 0.87 | 0.11 to 6.78 | 1.67 | 0.86 to 3.24 |