Table 2.
Sexual behaviour, prevalence and crude odds ratios for C. trachomatis infection in univariable logistic regression analysis
| Characteristic |
Girls |
Boys |
Both |
||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| N | (%) | nCT | (%) | OR | 95%CI | p1 | N | (%) | nCT | (%) | OR | 95%CI | p1 | OR | 95%CI | p1 | |
|
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 | |||
nCT, number of chlamydia cases, OR, odds ratio, CI, confidence interval, 1p-value for equality between categories, 2Includes the response: ‘Uncertain if any contraception was used’ (girls n = 3, boys n = 10), 3Includes the response: ‘Uncertain if any contraception was used’ (girls n = 3, boys n = 8).