Table 1—

Characteristics of pregnancies screened between 1994 and 2002

1994–200219942002P*
Pregnancies (n)36,4033,6444,079
Maternal age27.9 ± 6.028.1 ± 6.028.3 ± 6.00.4
Race/ethnicity (%)
    Non-Hispanic white21,444 (60.6)2,516 (68.8)2,373 (58.2)<0.0001
    Hispanic5,920 (16.3)396 (10.8)831 (20.4)<0.0001
    African American2,293 (6.3)158 (4.3)251 (6.2)<0.0001
    Asian1,465 (4.0)89 (2.4)280 (6.6)<0.0001
    Other498 (1.4)59 (1.6)4 (0.1)<0.0001
    Missing4,178 (11.5)441 (12.1)340 (8.3)<0.0001
  • Data are means ±SD or n (%).

  • *

    * 2002 versus 1994.