Table I.

Selected characteristics of women who completed the protocol classified by the outcome of the index pregnancy.

	Losses			Births
	Trisomy	Non-trisomy abnormal	Chromosomally normal
(1) New York sample
Number of women	38	17	11	50
Age (years) at the blood drawa [mean (SD)]	34.4 (5.9)	32.2 (4.2)	30.8 (5.5)	35.0 (6.2)
Ethnicity: White, non-Hispanicb,c (%)	97.4	94.1	90.9	94.0
(2) New Jersey sample
Number of women	169	65	88	487
Age (years) at the blood drawd [mean (SD)]	37.1 (4.6)	33.6 (4.2)	33.3 (4.9)	35.4 (4.8)
Ethnicity: White, non-Hispanicb,c (%)	85.2	86.2	81.8	86.9

^aMean age does not vary significantly with the outcome of the index pregnancy.

^bAdjusted for age, ethnicity does not vary significantly with the outcome of the index pregnancy.

^cIn the total sample, the 117 women who were not white, non-Hispanic include 59 Hispanics, 37 Asians, 13 blacks and 8 women of other or unknown ethnicity.

^dMean age varies significantly (P< 0.0001) with the outcome of the index pregnancy. As expected, women with trisomy losses are significantly older than women with non-trisomy losses. Because live birth controls were age matched to women with losses, women with births are significantly younger than women with trisomy losses and significantly older than women with non-trisomy losses.