Multiple regression analysis: independent effects of factors on Griffiths quotient at 2 years (preterm children only)
| Variable | Size of effect (B)4-150 | SE B | 95% CI | p Value |
|---|---|---|---|---|
| Both parents at home | +5.83 | 1.88 | (0.8 to 9.6) | .0023 |
| Non-manual SES | +6.04 | 1.28 | (3.0 to 9.2) | .0000 |
| Maternal age (per year) | +0.33 | .13 | (0.1 to 0.7) | .0127 |
| Number of siblings (per sibling) | −2.85 | .60 | (−1.4 to −4.2) | .0000 |
| Use of car by mother | +3.37 | 1.32 | (0.1 to 6.1) | .0112 |
↵4-150 GQ points