Social status and development: age at which mother left full time education (24 left after age 16 years; 105 left by 16; 29 not known)
| Assessment measure | Category | Mean | Standard deviation | P value |
|---|---|---|---|---|
| IQ: | ||||
| Full | Left >16 | 105.7 | 13.5 | |
| Left ≤16 | 92.4 | 12.9 | ||
| Missing | 84.9 | 14.4 | 0.0001 | |
| Verbal | Left >16 | 108.5 | 17.0 | |
| Left ≤16 | 92.7 | 12.2 | ||
| Missing | 87.6 | 14.6 | 0.0001 | |
| Performance | Left >16 | 102.0 | 14.3 | |
| Left ≤16 | 93.2 | 13.7 | ||
| Missing | 84.9 | 19.1 | 0.0002 | |
| Reading: | ||||
| Rate | Left >16 | 121.6 | 23.7 | |
| Left ≤16 | 109.5 | 22.3 | ||
| Missing | 99.8 | 25.0 | 0.0034 | |
| Accuracy | Left >16 | 118.1 | 20.0 | |
| Left ≤16 | 102.0 | 14.3 | ||
| Missing | 95.4 | 17.6 | 0.0001 | |
| Comprehension | Left >16 | 113.3 | 23.9 | |
| Left ≤16 | 96.0 | 13.4 | ||
| Missing | 91.1 | 17.1 | 0.0001 | |
| TOMI: | Left >16 | 3.00 | 2.45 | |
| Left ≤16 | 3.05 | 2.30 | ||
| Missing | 8.16 | 5.78 | 0.0001 |