Table 1 Baseline characteristics of cases and controls with medical record data
Cases ( n =178) (%) | Controls ( n =180) (%) | P -value | |
|---|---|---|---|
Maternal education | |||
⩽High school | 36.5 | 27.8 | 0.08 |
>High school | 32.0 | 36.7 | |
⩾College graduate | 31.5 | 35.6 | |
Household income | |||
<$30 000 | 36.2 | 27.8 | 0.09 |
$30 000–$75 000 | 46.3 | 48.3 | |
>$75 000 | 17.5 | 23.9 | |
Maternal race | |||
White | 79.2 | 86.7 | 0.004 |
Black | 2.3 | 5.0 | |
Hispanic | 11.2 | 3.3 | |
Other | 7.3 | 5.0 | |
Smoked during pregnancy | 18 | 20.6 | 0.53 |
Maternal age at birth of index child | 28.7 | 30.2 | 0.007 |
Average birth weight | 3503 g | 3467 g | 0.52 |
Average birth order (no. of previous live births) | 0.84 | 1.1 | 0.02 |
Average minimum hemoglobin concentration | 11.69 | 11.60 | 0.42 |
