| Percent of all subjects* | No. in lowest quartile (n = 1,613) | No. in middle two quartiles (Reference, n = 3,226) | No. in highest quartile (n = 1,602) | AOR (95% CI) for lowest versus middle quartiles** | AOR (95% CI) for highest versus middle quartiles** |
---|---|---|---|---|---|---|
Maternal race-ethnicity | Â | Â | Â | Â | Â | Â |
White, non-Hispanic | 61% | 1176 | 2183 | 541 | Reference | Reference |
Black, non-Hispanic | 11% | 234 | 330 | 170 | 1.3 (1.1, 1.6) | 1.4 (1.1, 1.8) |
Hispanic | 22% | 140 | 521 | 756 | 0.3 (0.3, 0.4) | 6.0 (4.9, 7.3) |
Other | 6% | 63 | 192 | 135 | 0.5 (0.3, 0.7) | 2.9 (2.2, 3.8) |
Maternal education | Â | Â | Â | Â | Â | Â |
< High school | 16% | 188 | 405 | 469 | Reference | Reference |
High school | 24% | 449 | 719 | 409 | 1.1 (0.9, 1.4) | 0.9 (0.7, 1.1) |
> High school | 59% | 976 | 2102 | 724 | 0.7 (0.6, 0.9) | 1.0 (0.8, 1.3) |
Maternal age | Â | Â | Â | Â | Â | Â |
< 25 years | 33% | 587 | 951 | 592 | 1.7 (1.4, 2.0) | 0.7 (0.6, 0.8) |
25-34 years | 53% | 848 | 1758 | 792 | Reference | Reference |
35+ years | 14% | 178 | 517 | 218 | 0.5 (0.4, 0.6) | 1.6 (1.3, 2.0) |
Folic acid-containing supplement intake | Â | Â | Â | Â | Â | Â |
None | 5% | 66 | 148 | 93 | Reference | Reference |
Began in 3 mo. before pregnancy | 34% | 527 | 1221 | 433 | 0.7 (0.5, 1.1) | 1.9 (1.3, 2.8) |
Began in first trimester | 54% | 912 | 1647 | 892 | 0.9 (0.6, 1.3) | 1.5 (1.0, 2.1) |
Began after first trimester | 8% | 108 | 210 | 184 | 1.0 (0.6, 1.5) | 1.4 (0.9, 2.1) |