Table 1.

Distribution of maternal and neonatal characteristics in case and control mothers

Black mothers
White mothers
All mothers
Cases (n = 77)Controls (n = 77)PCases (n = 122)Controls (n = 122)PCases (n = 199)Controls (n = 199)P
Age at blood draw (y)*23.9 (6.0)24.4 (6.3)0.6526.3 (7.0)25.3 (6.1)0.2425.4 (6.7)24.9 (6.2)0.49
Height (in.)*63.5 (2.8)63.6 (2.5)0.9763.6 (2.6)63.7 (2.4)0.8863.6 (2.7)63.6 (2.4)0.93
Prepregnant weight (lbs)*138.9 (31.8)133.3 (26.8)0.28130.8 (24.8)129.4 (20.2)0.75134.0 (28.0)130.9 (23.0)0.31
Gestational age (wk)*,30.3 (2.7)31.1 (2.7)0.1031.3 (2.4)30.9 (2.6)0.2530.9 (2.6)31.0 (2.6)0.78
Birth weight (g)*3,138.0 (548)3,182.6 (527)0.603,370.8 (501)3,383.8 (507)0.833,281 (531)3,306 (523)0.61
Placental weight (g)*442.0 (101.9)422.9 (95.3)0.46449.8 (91.8)460.1 (86.9)0.32447.0 (95.4)447.2 (91.4)0.72
Prior pregnancies (n, %)
    No21 (27%)16 (21%)0.2823 (19%)35 (29%)0.0744 (22%)51 (26%)0.46
    Yes53 (69%)61 (79%)98 (80%)86 (70%)151 (76%)147 (73%)
    Unknown3 (4%)1 (1%)1 (1%)4 (2%)1 (1%)
Smoking (n, %)
    No38 (49%)43 (55%)0.4250 (41%)60 (50%)0.2488 (44%)103 (52%)0.18
    Yes39 (51%)34 (45%)72 (59%)61 (50%)111 (56%)95 (48%)
    Unknown1
Preeclampsia (n, %)
    No74 (96%)73 (95%)0.99117 (96%)120 (98%)0.25191 (96%)193 (97%)0.40
    Yes3 (4%)3 (4%)5 (4%)2 (2%)8 (4%)5 (3%)
    Unknown101 (1%)
Socioeconomic index (n, %)
    Low18 (24%)21 (27%)0.1410 (8%)11 (9%)0.4928 (14%)32 (16%)0.14
    Medium50 (65%)40 (52%)51 (42%)42 (34%)101 (51%)82 (41%)
    High8 (10%)16 (21%)60 (49%)68 (56%)68 (34%)84 (42%)
    Unknown1 (1%)01 (1%)1 (1%)2 (1%)1 (1%)
  • * Mean and SD of variable is shown.

  • Gestational age at blood draw.