Category | Incident cases | Person-years (PY) | Incidence rate per 100 PY | Incident rate ratio | p Value |
---|---|---|---|---|---|
Overall | 486 | 6621 | 7.3 (6.7 to 8.0) | – | – |
Sex | |||||
Male | 65 | 2655 | 2.4 (2.0 to 3.1) | 1 | – |
Female | 421 | 3966 | 10.6 (9.6 to 11.7) | 4.4 (3.4 to 5.8) | <0.001 |
Age group (years) | |||||
Men | |||||
16–19 | 15 | 415 | 3.6 (2.2 to 6.0) | 1.5 (0.6 to 4.0) | 0.373 |
20–24 | 12 | 505 | 2.4 (1.3 to 4.2) | 1.2 (0.5 to 4.0) | 0.756 |
25–29 | 8 | 445 | 1.8 (0.9 to 3.6) | 0.9 (0.3 to 2.8) | 0.874 |
30–34 | 9 | 355 | 2.5 (1.3 to 4.9) | 1.3 (0.4 to 4.0) | 0.698 |
35+ | 21 | 934 | 2.2 (1.5 to 3.4) | 1 | – |
Age group (years) | |||||
Women | |||||
16–19 | 98 | 495 | 19.8 (16.2 to 24.1) | 2.8 (2.0 to 4.1) | <0.001 |
20–24 | 116 | 823 | 14.1 (11.8 to 16.9) | 2.0 (1.4 to 2.9) | <0.001 |
25–29 | 68 | 772 | 8.8 (6.9 to 11.1) | 1.3 (0.9 to 1.8) | 0.215 |
30–34 | 51 | 544 | 9.4 (7.1 to 12.3) | 1.7 (1.1 to 2.5) | 0.017 |
35+ | 88 | 1332 | 6.6 (5.4 to 8.1) | 1 | – |
NG prevalent infection* | |||||
No | 432 | 6246 | 7.0 (6.3 to 7.6) | 1 | – |
Yes | 54 | 375 | 14.4 (11.0 to 18.8) | 1.7 (1.1 to 2.6) | 0.021 |
NG incident infection † | |||||
No | – | – | – | 1 | |
Yes | – | – | – | 2.7 (2.0 to 3.7) | <0.001 |
CT prevalent infection‡ | |||||
No | 431 | 6174 | 7.0 (6.3 to 7.7) | 1 | – |
Yes | 55 | 448 | 12.3 (9.4 to 16.0) | 1.7 (1.1 to 2.5) | 0.464 |
CT incident infection† | |||||
No | – | – | – | 1 | – |
Yes | – | – | 21.3 (18.1 to 25.1) | 3.5 (2.6 to 4.8) | <0.001 |
*1034 NG positive at baseline, refers to a positive infection prior to the incident TV infection.
†Included in time dependent analysis only, refers to a positive infection at the same time as the incident TV infection.
‡1303 CT positive at baseline, refers to a positive infection prior to the incident TV infection.
CT, Chlamydia trachomatis; NG, Neisseria gonorrhoeae; STI, sexually transmissible infection.