Table 1.

Maternal characteristics in early preterm pregnancies compared to term pregnancies.

	California		Iowa
	Cases < 30 Weeks	Controls ≥ 37 Weeks	Cases < 30 Weeks	Controls ≥ 37 Weeks
	% 100.0 (n = 72)	% 100.0 (n =36)	% 100.0 (n = 57)	% 100.0 (n = 677)
Race/Ethnicity
White	30.6	27.8	100.0	100.0
Hispanic	62.5	52.8	0	0
Black	1.4	8.3	0	0
Asian	4.2	8.3	0	0
Other	1.4	2.8	0	0
Maternal Age (Years)
< 18 Years	1.4	2.8	0	1.6
18 – 34	62.2	86.1	89.5	86.6
≥ 35	27.8	11.1	10.5	11.8
Parity
1	41.7	38.9	59.7	41.4
≥ 2	58.3	61.1	40.3	58.6a

	Mean (SD)	Mean (SD)	Mean (SD)	Mean (SD)
Weight at Test (pds)	161.9 (42.2)a	140.6 (32.4)	177.4 (48.9)	171.4 (41.7)
Week at Test (15-20)	16.8 (1.3)	16.9 (1.4)	16.7 (1.3)	16.8 (1.3)

SD, Standard Deviation; pds, pounds.

^ap = < .01