Table 3.
Mean test scores for birthweight centiles for twins and singletons born in Denmark during 1986-8
| Birthweight centiles (%) | Singletons* | Twins | |||||
|---|---|---|---|---|---|---|---|
| No | Mean (SD) birth weight (g) | Mean (SD) test score | No | Mean (SD) birth weight (g) | Mean (SD) test score | ||
| 0-10 | 694 | 2524 (354) | 7.85 (1.04) | 288 | 1565 (256) | 7.84 (1.10) | |
| 11-25 | 1014 | 3026 (84) | 7.93 (1.08) | 458 | 2093 (108) | 7.90 (1.02) | |
| 26-50 | 1586 | 3325 (89) | 8.02 (1.06) | 692 | 2451 (98) | 8.03 (1.05) | |
| 51-75 | 1731 | 3635 (100) | 8.10 (1.02) | 755 | 2780 (96) | 8.04 (1.03) | |
| 76-90 | 911 | 3962 (85) | 8.07 (1.08) | 389 | 3079 (75) | 8.17 (1.04) | |
| 91-100 | 620 | 4375 (236) | 8.08 (1.04) | 279 | 3450 (192) | 8.12 (1.07) | |
*5% random sample of Danish birth cohorts, 1986-8.