TABLE 1.

Comparison of Subjects in Analysis Sample and Subjects Not in Analysis Sample

In Sample (n = 651)Not in Sample (n = 150)
Cocaine exposure, %3796*
Maternal age, y27.1 ± 5.729.0 ± 6.1*
Prepregnancy weight, lb149.1 ± 39.8140.7 ± 39.3*
Parity, no.3 ± 24 ± 2*
Socioeconomic status29 ± 1128 ± 11
Gestational age, wk39 ± 239 ± 2
Black race, %7764*
White race, %1426*
More than high school education, %2121
Sexually transmitted disease, %2628
Hospitalized, %1819
Hypertension/preeclampsia, %42
Diabetes mellitus, %21
Other infections, %3440
Abruptio placenta, %30*
  • Data are presented as percentage and mean ± SD.

  • * P < .05.

  • Socioeconomic status was measured with the Hollingshead index.