Table 4.
Difference between IQ at 10 years of age and MDI at 2 years adjusted age (95% confidence limits).
| Factor | Level | Median (95% CI)* | N | p-value** |
|---|---|---|---|---|
| Maternal education | ≤ 12 | 6 (2.5, 9) | 294 | 0.20 |
| 13-15 | 4 (−1.5, 8) | 165 | ||
| ≥ 16 | 4 (2, 6) | 276 | ||
| Public insurance | Yes | 6.25 (4, 9.5) | 254 | 0.16 |
| No | 4 (1.5, 6) | 481 | ||
| Pre-pregnancy BMI | ≥ 30 | 9 (3.5, 13) | 155 | 0.01 |
| < 30 | 4 (2, 5.5) | 555 | ||
| ELGAN site at birth | New England | 4.5 (1, 7) | 296 | 0.92 |
| North Carolina | 4.25 (2, 8) | 218 | ||
| Lake Michigan | 5.5 (2.5, 9) | 221 | ||
| Sex | Male | 6.5 (4, 9) | 369 | 0.01 |
| Female | 3 (1, 5.5) | 366 | ||
| Gestational age | 23-24 | 7 (3, 13) | 129 | 0.14 |
| 25-26 | 3.5 (1, 6) | 337 | ||
| 27 | 5.5 (2, 9) | 269 | ||
| Birth weight Z-score | < −2 | 6.5 (−5, 12.5) | 41 | 0.41 |
| ≥ −2, < −1 | 2.5 (01.5, 7.5) | 98 | ||
| ≥ −1 | 5 (3.5, 7) | 325 | ||
| White matter abnormality (VM and/or EL) | Yes | 4.25 (−0.5, 10) | 80 | 0.67 |
| No | 5 (3, 6.5) | 655 | ||
| PDI at 2 years | < 55 | 11.75 (5.5, 16) | 70 | 0.0001 |
| 55-69 | 16 (6.5, 21) | 107 | ||
| 70-84 | 9 (5.5, 11) | 158 | ||
| ≥ 85 | 1 (−0.5, 3) | 384 | ||
| Weight Z-score at 2 years | < −2 | 6.25 (−0.5, 16) | 36 | 0.56 |
| ≥ −2, < −1 | 5.5 (0, 9) | 115 | ||
| ≥ −1 | 4 (2, 6) | 563 | ||
| Weight Z-score at 10 years | < −2 | 5.75 (−5.5, 11) | 46 | 0.82 |
| ≥ −2, < −1 | 6.25 (3.5, 9) | 144 | ||
| ≥ −1 | 4.5 (2.5, 6) | 538 | ||
| Total sample | 5 (3, 6.5) | 735 |