TABLE 1—
Maternal and Infant Characteristics of SIDS Case Subjects, Control Subjects Who Died of Non-SIDS Causes, and Live Control Subjects
| SIDS Case Subjects a | Live Control Subjects b | Control Subjects Dead from Non-SIDS Causes c | |
| Education | |||
| Elementary school | 7 | 6 | 7 |
| Some high school | 32 | 16 | 23 |
| High school | 35 | 34 | 35 |
| Some college | 14 | 20 | 16 |
| College graduate | 7 | 19 | 11 |
| Age | 23.8 (5.6) | 26.7 (5.9) | 25.7 (6.3) |
| Region | |||
| Northeast | 11 | 18 | 19 |
| Midwest | 27 | 22 | 20 |
| South | 36 | 35 | 39 |
| West | 25 | 25 | 22 |
| Nativity | |||
| Born in United States | 92 | 82 | 81 |
| Born outside United States | 8 | 18 | 16 |
| Race/ethnicity | |||
| White | 58 | 63 | 45 |
| Black | 28 | 15 | 35 |
| Hispanic | 10 | 17 | 16 |
| Other | 5 | 5 | 4 |
| Married | 48 | 70 | 50 |
| Parity | |||
| 1 | 30 | 41 | 40 |
| 2 | 34 | 32 | 28 |
| ≥ 3 | 36 | 26 | 30 |
| Tobacco use during pregnancy | 30 | 12 | 14 |
| Female sex | 40 | 49 | 44 |
| Gestation, wk | 38.6 (3.1) | 39.2 (2.3) | 31.6 (7.9) |
| Preterm delivery (> 37 weeks’ gestation) | 18 | 8 | 56 |
| Birthweight, g | 3115 (632) | 3382 (535) | 1893 (1291) |
| Very low birthweight (< 1500 g) | 2 | 0 | 45 |
| Low birthweight (< 2500 g) | 12 | 4 | 12 |
| 5-minute Apgar score | 8.9 (0.7) | 9.0 (0.6) | 5.7 (3.5) |
Note. Values in table are mean and SD for continuous variables and percentages for categorical variables
a Total N = 21 126; 1989–1991: N = 13 830; 1996–1998: N = 7296.
b Total N = 2 161 580; 1989–1991: N = 1 050,124; 1996–1998: N = 1 027 144.
c Total N = 79 638; 1989–1991: N = 46 829; 1996–1998: N = 32 809.