Endometriosis as a risk factor for ovarian or endometrial cancer — results of a hospital-based case–control study

BMC Cancer

Table 2 Logistic regression analyses, showing adjusted^a odds ratios (ORs), with the corresponding 95 % confidence intervals (CIs) in brackets

Predictor		OR (95 % CI)
Age^b	Younger vs. medium	1.36 (1.11, 1.66)
	Older vs. medium	1.24 (1.07, 1.43)
	Older vs. younger	0.91 (0.70, 1.18)
BMI^c	Low vs. medium	0.99 (0.83, 1.17)
	High vs. medium	1.26 (1.09, 1.46)
	High vs. low	1.28 (0.95, 1.72)
Oral contraceptive use	Yes vs. no	0.43 (0.32, 0.58)
No. of pregnancies	Per-pregnancy increase	0.93 (0.84, 1.02)
Self-reported endometriosis	yes vs. no	2.63 (1.28, 5.41)

BMI body mass index
^aORs were estimated using a multiple logistic regression model, with the predictors listed in the first column of the table
^bAge was used as a nonlinear continuous predictor. It was evaluated at the first sextile (“young” — i.e., 51 years), median (“medium” — i.e., 62 years), and fifth sextile (“older” — i.e., 70 years)
^cBMI was used as a nonlinear continuous predictor. It was evaluated at the first sextile (“low” — i.e., 21.7 kg/m²), median (“medium” — i.e., 25.0 kg/m²), and fifth sextile (“high” — i.e., 30.1 kg/m²)