| IQ | ALL Survivors N = 61 Mean ± SD | Control N = 34 Mean ± SD | P-value |
| Total | 84.8 ± 10.0 | 98.7 ± 10.3 | <0.001* |
| Verbal IQ | 94.4 ± 13.5 | 110.1 ± 13.6 | <0.001* |
| Information | 8.1 ± 2.5 | 11.3 ± 2.8 | <0.001* |
| Comprehensive | 7.4 ± 2.8 | 9.1 ± 2.7 | <0.006* |
| Arithmetic | 8.3 ± 2.7 | 10.0 ± 3.0 | <0.008* |
| Similarities | 9.0 ± 3.0 | 10.3 ± 3.4 | <0.048* |
| Vocabulary | 7.6 ± 7.6 | 10.6 ± 2.3 | <0.001* |
| Digit repetition | 7.0 ± 1.8 | 8.8 ± 2.0 | <0.001* |
| Performance IQ | 76.6 ± 10.0 | 85.3 ± 8.5 | <0.001∗ |
| Picture complete | 6.4 ± 2.3 | 7.4 ± 2.0 | <0.041* |
| Picture arrangement | 6.6 ± 2.7 | 7.3 ± 1.3 | <0.191 |
| Blocks digits | 7.5 ± 1.7 | 8.7 ± 2.0 | <0.004* |
| Objects assembly | 5.0 ± 1.8 | 6.8 ± 2.3 | <0.001* |
| Coding | 7.0 ±2.7 | 9.1 ± 2.0 | <0.001* |