Non-participants (n=6792) | Participants (n=2208) | |||||
IR | n | IR | N | HR | 95% CI | |
Women | 2825 | 1175 | ||||
PID | 0.45 | 16 | 0.47 | 7 | 0.96 | 0.40 to 2.34 |
EP | 0.07 | 19 | 0.07 | 8 | 1.00 | 0.44 to 2.28 |
Infertility | 0.33 | 85 | 0.41 | 44 | 0.81 | 0.56 to 1.17 |
IVF treatment | 0.15 | 31 | 0.14 | 12 | 1.09 | 0.56 to 2.12 |
Births | 2.87 | 659 | 3.19 | 308 | 0.90 | 0.79 to 1.03 |
Men | 3967 | 1033 | ||||
Epididymitis | 0.20 | 10 | 0.46 | 6 | 0.44 | 0.14 to 1.20 |
For the pelvic inflammatory disease (PID) and epidymitis diagnoses, the follow-up time was 1 year. For in-vitro fertilisation (IVF) treatment, the follow-up time was 7 years, and for all other outcomes, the follow-up time was 9 years. Cox regression analyses were performed.
IR, incidence rate per 100 person-years at risk.
EP, ectopic pregnancy.