Figure 1.

Relative risk of cancer incidence by site or type among women with vs without tubal ligation. Results are adjusted for age, region, socioeconomic status, parity, age at first birth, hysterectomy, smoking, alcohol intake, physical activity, body mass index, and use of the oral contraceptive pill or menopausal hormones. The analysis of fallopian tube cancer is restricted to women without bilateral oophorectomy or hysterectomy. The analysis of ovarian cancer is restricted to women without bilateral oophorectomy. Analyses of endometrial and cervical cancer are restricted to women without hysterectomy.