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Mean IGF-1 and IGFBP-3 concentrations (ng/ml) at age 12 and 18 months
| 12 month N |
12 month Mean (sd) | 18 month N |
18 month Mean (sd) | P valuea | |
|---|---|---|---|---|---|
| IGF1 | 317 | 35·7 (14·8) | 312 | 43·2 (17·8) | < 0·001 |
| IGFBP3 | 292 | 1670·8 (514·4) | 276 | 1902·6 (619·0) | < 0·001 |
aMean differences between 12 and 18 month IGF measurements were analysed using paired samples t-test
