TABLE IV.
Distribution of Demographic Characteristics by Spina Bifida Classification, Pre- and Post-Fortification
| Pre-fortificationa
|
Post-fortificationb
|
|||||||
|---|---|---|---|---|---|---|---|---|
| Isolated SB (n = 733)
|
Non-isolated SB (n = 147)
|
Isolated SB (n = 185)
|
Non-isolated SB (n = 71)
|
|||||
| n | % | n | % | n | % | n | % | |
| Infant sex | ||||||||
| Male | 315 | 43.0 | 70 | 47.6 | 87 | 47.0 | 36 | 50.7 |
| Female | 390 | 53.2 | 73 | 49.7 | 93 | 50.3 | 34 | 47.9 |
| Unknown | 28 | 3.8 | 4 | 2.7 | 5 | 2.7 | 1 | 1.4 |
| Maternal race/ethnicity | ||||||||
| White, non-Hispanic | 681 | 92.9 | 130 | 88.4 | 109 | 58.9 | 46 | 64.8 |
| Black, non-Hispanic | 24 | 3.3 | 10 | 6.8 | 24 | 13.0 | 3 | 4.2 |
| Other racesc | 28 | 3.8 | 7 | 4.8 | 52 | 28.1 | 22 | 31.0 |
| Hispanic (1983+) | 15 | 2.0 | 5 | 3.4 | 38 | 20.5 | 18 | 25.4 |
| Maternal age at conception | ||||||||
| <20 years | 57 | 7.8 | 18 | 12.2 | 16 | 8.6 | 4 | 5.6 |
| 20–29 years | 430 | 58.7 | 82 | 55.8 | 81 | 43.8 | 44 | 62.0 |
| ≥30 years | 246 | 33.6 | 47 | 32.0 | 88 | 47.6 | 23 | 32.4 |
| Maternal education | ||||||||
| <12 years | 109 | 14.9 | 28 | 19.0 | 30 | 16.2 | 9 | 12.7 |
| 12 years | 289 | 39.4 | 62 | 42.2 | 37 | 20.0 | 25 | 35.2 |
| >12 years | 334 | 45.6 | 57 | 38.8 | 117 | 63.2 | 37 | 52.1 |
| Missing data | 1 | 0.1 | 0 | 0.0 | 1 | 0.5 | 0 | 0.0 |
| Folic acid intake | ||||||||
| ≥400 μg | 129 | 17.6 | 22 | 15.0 | 94 | 50.8 | 33 | 46.5 |
| <400 μg | 567 | 77.4 | 117 | 79.6 | 82 | 44.3 | 36 | 50.7 |
| Missing data | 37 | 5.0 | 8 | 5.4 | 9 | 4.9 | 2 | 2.8 |
a
LMP dates prior to January 1, 1996.
b
LMP dates on or after January 1, 1998.
c
Other races includes Hispanic race/ethnicity.