Table 3. Baseline lifestyle and reproductive characteristics between women with surgically confirmed endometriosis and those with imaging-diagnosed endometriosis without surgery.

		Surgically confirmed endometriosis (Group A)		Imaging-diagnosed endometriosis without surgery (Group B)
		Number	Proportion	Number	Proportion
Age (years)	<35	45	21.4	31	25.8
	35–44	93	44.3	57	47.5
	45–54	60	28.6	29	24.2
	55–64	11	5.2	3	2.5
	≥65	1	0.5	0	0.0
	Unknown	0	0.0	0	0.0
Age at diagnosis (years)	<30	76	36.2	56	46.7
	30–39	92	43.8	49	40.8
	≥40	36	17.1	14	11.7
	Unknown	6	2.9	1	0.8
Calendar year at diagnosis	<1990	56	26.7	35	29.2
	1990–1999	101	48.1	54	45.0
	≥2000	47	22.4	30	25.0
	Unknown	6	2.9	1	0.83
Age at menarche (years)	≤11	51	24.3	32	26.7
	12	79	37.6	35	29.2
	13	46	21.9	28	23.3
	≥14	33	15.7	24	20.0
	Unknown	1	0.5	1	0.8
Length of menstrual cycle at 18–22 years of age (days)	≤25	24	11.4	15	12.5
	26–31	144	68.6	79	65.8
	32–49	30	14.3	16	13.3
	≥50	10	4.8	8	6.7
	Unknown	2	1.0	2	1.7
Deliveries (numbers)	0	105	50.0	42	35.0
	1	46	21.9	23	19.2
	≥2	49	23.3	49	40.8
	Unknown	10	4.8	6	5.0
Smoking at 30 years of age	Never	148	70.5	74	61.7
	Current smoker	45	21.4	35	29.1
	Ex-smoker	15	7.1	11	9.2
	Unknown	2	1.0	0	0.0
BMI at 18 years of age	<18.5	17	8.1	14	11.7
	≥18.5 and <22.5	138	65.7	75	62.5
	≥22.5	44	21.0	27	22.5
	Unknown	11	5.2	4	3.3
History of infertility	No	109	51.9	82	68.3
	Yes	93	44.3	34	28.3
	Unknown	8	3.8	4	3.3
Current use of oral contraceptive for contraception	No	208	99.0	116	96.7
	Yes	2	1.0	4	3.3
	Unknown	0	0.0	0	0.0

BMI, body mass index.