From: Risk of uterine, ovarian and breast cancer following pelvic inflammatory disease: a nationwide population-based retrospective cohort study
Ovarian cancer group
(N = 55)
Control group
(N = 220)
OR = 1.40
(95 % CI 0.72–2.70)
P = 0.32
PID (%)
16 (29.09)
50 (22.73)