Table 1.

Basic characteristics of study participants from NHANES 1999–2006.

characteristics	Total	Endometriosis		P for trand
		With	Without
Sample size	2274	182	2292
Age (years)	37.17 ± 9.95	40.37 ± 8.22	36.82 ± 10.06	<0.0001
BMI (kg/m2)	28.03 ± 7.09	28.56 ± 6.66	27.98 ± 7.14	0.2249
Menarche age (years)	12.65 ± 1.66	12.42 ± 1.68	12.68 ± 1.66	0.0245
TG (mmol/L)	1.38 ± 1.19	1.84 ± 2.48	1.33 ± 0.93	<0.0001
HDL-C (mmol/L)	1.47 ± 0.41	1.44 ± 0.42	1.47 ± 0.40	0.2839
waist circumference (cm)	91.99 ± 16.00	94.06 ± 15.36	91.76 ± 16.05	0.0338
height (cm)	163.46 ± 6.63	163.77 ± 6.07	163.43 ± 6.69	0.4498
Ethnicity,%				<0.0001
Mexican American	7.69	1.48	8.37
Other Hispanic	5.81	1.78	6.25
Non-Hispanic White	68.83	84.70	67.12
Non-Hispanic Black	12.42	8.36	12.85
Other Race	5.25	3.67	5.42
Education level,%				0.0057
Less than high school	15.98	10.16	16.61
High school	23.24	29.58	22.55
More than high school	60.78	60.26	60.83
PIR,%				0.0149
Low	21.58	20.57	21.68
Intermediate	27.12	20.08	27.89
High	51.30	59.35	50.43
marital status,%				0.0002
Married/living with partner	66.60	75.19	65.67
Separated/divorced/widowed	15.35	16.32	15.24
Never married	18.06	8.49	19.09
Blood pressure (mmHg)
systolic	113.98 ± 14.34	117.34 ± 15.72	113.62 ± 14.14	0.0001
diastolic	69.82 ± 10.05	72.44 ± 10.40	69.54 ± 9.96	<0.0001
Smoking,%				0.5840
Current-smoker	52.84	54.50	52.65
Non-smoker	47.16	45.50	47.35
Drinking,%				0.2504
Yes	61.71	58.30	62.08
No	38.29	41.70	37.92
Oophorectomy (at least one ovary), %				<0.0001
Yes	10.00	40.28	6.68
No	90.00	59.72	93.27
hysterectomy, %				<0.0001
Yes	19.7	48.38	16.57
No	80.3	51.62	83.43
CMI	0.65 ± 0.86	0.95 ± 1.77	0.62 ± 0.69	<0.0001

Data are presented as (%) or Mean ± SD.

BMI, body mass index; TG, triglycerides; HDL-C, high-density lipoprotein cholesterol; PIR, Poverty income ratio.