Characteristics of 182 children of birthweight < 2 kg ≤ 32 weeks
| Variable | Minimum | Maximum | Mean | Standard deviation |
|---|---|---|---|---|
| Tested (158 children) | ||||
| Birthweight (kg) | 0.6 | 2.0 | 1.3 | 0.3 |
| Gestational age (weeks) | 25.0 | 32.0 | 29.7 | 1.8 |
| Birthweight ratio | 0.4 | 1.5 | 0.9 | 0.2 |
| Maternal age | 17.0 | 40.0 | 26.3 | 5.5 |
| Age at testing postnatal age in months | 96.0 | 127.2 | 103.2 | 6.0 |
| IQ: full | 52.0 | 141.0 | 93.0 | 14.6 |
| IQ: verbal | 46.0 | 150.0 | 94.2 | 14.8 |
| IQ: performance | 45.0 | 130.0 | 93.0 | 15.3 |
| Reading rate | 71.0 | 162.0 | 109.5 | 23.7 |
| Reading accuracy | 71.0 | 152.0 | 103.2 | 17.2 |
| Reading comprehension | 71.0 | 151.0 | 97.7 | 17.4 |
| TOMI | 0.0 | 16.0 | 4.0 | 3.8 |
| Not tested (15 children) | ||||
| Birthweight (kg) | 0.8 | 1.5 | 1.1 | 0.2 |
| Gestational age (weeks) | 25.0 | 32.0 | 28.6 | 2.3 |
| Birthweight ratio | 0.5 | 1.1 | 0.9 | 0.2 |
| Maternal age | 20.0 | 37.0 | 28.5 | 5.2 |
| Age at attempted testing (years) | 7.1 | 10.6 | 8.8 | 0.8 |
| Refused or emigrated (9 children) | ||||
| Birthweight (kg) | 0.8 | 1.4 | 1.1 | 0.2 |
| Gestational age (weeks) | 26.0 | 32.0 | 29.2 | 2.1 |
| Birthweight ratio | 0.6 | 1.1 | 0.8 | 0.2 |
| Maternal age | 16.0 | 35.0 | 26.1 | 5.8 |
A score of 71 for reading indicates the child was unable to reach the basic level.