Table 1.

Characteristics of Fertile, Subfertile, and ART-Treated Women, among all Women Stratified by Vaginal versus Cesarean Delivery

	All	Vaginal			Cesarean
		Fertile	Subfertile	ART	Fertile	Subfertile	ART
All deliveries	173,130	113,104	1,506	3,133	51,601	1,151	2,635
Maternal age (years)
Mean (SD)	28.0 (6.1)	27.0 (5.9)	33.4 (4.9)	34.5 (4.5)	29.0 (5.9)	34.9 (4.8)	36.2 (4.8)
Age groups (%)
≤30	64	70	28	19	58	18	11
31–34	22	20	30	32	24	29	27
35–37	9	7	21	23	11	23	22
38–40	4	3	14	16	5	18	20
>40	2	1	7	10	2	13	19
Race/Ethnicity (%)
Hispanic	12	13	4	3	10	5	4
NH-White	70	69	84	85	72	81	82
NH-Black	7	7	2	2	8	5	4
NH-Asian	8	9	8	8	8	8	9
NH-Other	2	2	1	1	2	1	1
Education (%)
≤ High School	33	36	11	8	30	13	10
Some College	20	20	14	13	22	18	17
≥College	47	44	75	78	48	69	73
Marital Status (%)
Married	64	60	93	95	66	93	95
Not married	36	40	7	5	34	7	5
Insurance (%)
Private	63	60	91	96	66	91	96
Self-Pay	1	1	1	1	1	1	1
Public/Free	36	39	8	3	33	8	3
Chronic Disease (%)
Diabetes	1.2	0.8	1.5	1.7	1.9	2.1	3.0
Hypertension	1.7	1.2	1.9	2.3	2.5	5.0	4.6
Uterine Surgery Prior to Conception (%)
Yes	0.4	0.1	0.9	0.5	0.6	5.3	5.6