Table 4. Cognitive Functioning at 4 and 7 Years and Academic Functioning at 8 Years by Perinatal Problems.
| Cognitive Function | Mean (sd) | Mean (sd) | F statistics | p-value | Mean (sd) | Mean (sd) | F statistics | p-value | Mean (sd) | Mean (sd) | F statistics | p-value |
| 4 Yr IQa | 93.3 (.7) | 88.5 (4.1) | F(1, 2048)=31.3 | p<.0001 | 93.5 (.93) | 89.2 (3.4) | F(1,2048)= 34.4 | p<.0001 | 92.9 (.31) | 89.4 (3.2) | F(1,2048)=10.9 | p=.001 |
| 7 Yr IQb | 92.5 (.64) | 88.1 (3.8) | F(1, 2136)=35.6 | p<.0001 | 92.6 (.67) | 89.4 (2.5) | F(1,2136)= 24.2 | p<.0001 | 92.1 (.26) | 89.2 (2.7) | F(1,2136)=10.1 | p=.002 |
| Learning Function | ||||||||||||
| 8 Yr WRATc Reading | 31.3 (.46) | 28.1 (2.7) | F(1, 2108)=28.7 | p<.0001 | 31.2 (.32) | 29.7 (1.2) | F(1,2108)= 8.3 | p=.004 | 31.0 (.13) | 29.5 (1.3) | F(1, 2108)=3.8 | p=.05 |
| 8 Yr WRATc Spelling | 22.5 (.21) | 21.0 (1.3) | F(1, 2105)=22.3 | p<.0001 | 22.5 (.17) | 21.7 (.63) | F(1,2105)= 8.8 | p=.003 | 22.4 (.05) | 21.8 (.50) | F(1, 2105)=1.9 | p=.09 |
| 8 Yr WRATc Arithmetic | 19.3 (.25) | 17.6 (1.5) | F(1, 2105)=53.2 | p<.0001 | 19.2 (.20) | 18.3 (.74) | F(1,2105)= 0.6 | p<.0001 | 19.1 (.09) | 18.1 (.97) | F(1, 2105)=11.9 | p=.001 |
a
Stanford Benet
b
WISCIII
c
WRAT = Wide Range Achievement Test. Each area of development at 8 month was evaluated by pediatric neurologists and at 4 years by child psychologists. All tests were administered by child psychologists.
d
abnormal or suspect
AOR = adjusted odd ratios. CI = confidence interval. Poverty, sex and race were statistically controlled for.
N may vary due to missing values.