Table 2. Means and bias corrected bootstrap confidence intervals for five gestational age groups adjusted for age, sex, and maternal education.
| 24–27 weeks | 28–29 weeks | 30–31 weeks | 32 weeks | Term born | |
|---|---|---|---|---|---|
| (n = 10) | (n = 14) | (n = 19) | (n = 14) | (n = 49) | |
| M (95%-CI) | M (95%-CI) | M (95%-CI) | M (95%-CI) | M (95%-CI) | |
| GMV (ml) | 753 (720–782) | 757 (725–788) | 803 (777–829) | 808 (770–843) | 789 (773–807) |
| WMV (ml) | 426 (396–455) | 461 (430–493) | 481 (457–506) | 498 (471–529) | 468 (453–482) |
| CSF (ml) | 163 (141–185) | 161 (149–175) | 153 (139–171) | 158 (149–168) | 151 (145–159) |
| Total ICV | 1343 (1264–1421) | 1380 (1309–1454) | 1438 (1385–1494) | 1465 (1406–1527) | 1407 (1375–1438) |
| Full Scale IQ 1 | 95.6 (85.8–104.7) | 100.7 (93.1–108.4) | 107.4 (102.2–113.6) | 109.8 (104.3–114.9) | 105.8 (102.8–108.6) |
| Verbal Comprehension1 | 97.5 (92.2–103.4) | 103.5 (95.7–111.6) | 104.5 (98.5–110.3) | 109.9 (103.1–116.9) | 102.1 (98.1–106.1) |
| Reasoning1 | 100.4 (85.3–114.0) | 107.0 (100.3–114.1) | 110.0 (104.6–115.2) | 109.6 (103.8–115.2) | 110.9 (107.6–113.8) |
| Working Memory1 | 98.5 (91.5–105.4) | 100.4 (92.7–107.5) | 107.5 (102.0–113.9) | 109.0 (101.0–117.2) | 104.3 (99.8–108.5) |
| Processing speed1 | 87.5 (77.8–97.9) | 94.0 (85.1–102.8) | 100.4 (93.8–107.5) | 101.3 (95.3–107.7) | 101.1 (97.8–104.4) |
1 WISC-IV IQ score normative mean = 100 (SD = 15). GMV, Gray Matter Volume; WMV, White Matter Volume; CSF, Cerebrospinal fluid; ICV, Intracranial Volume.