82 Chapter 4 Table 5. Regression analyses of intake as a predictor of IGF-1 levels at 30 weeks postmenstrual age. Variables Model R² Model p-Value B (SE) β p-Value Energy intake model 1: 0.605 0.006 Constant 11.8 (6.7) 0.106 Energy intake (kcal/day) 0.05 (0.02) 0.6 0.015 Gestational age (weeks) −0.6 (0.2) −0.5 0.029 Energy intake model 2: 0.640 0.014 Constant 9.4 (7.1) 0.215 Energy intake (kcal/day) 0.03 (0.03) 0.3 0.395 Gestational age (weeks) −0.5 (0.2) −0.4 0.073 Weight (grams) 0.003 (0.003) 0.36 0.348 Protein intake model 1: 0.578 0.009 Constant 14.5 (6.7) 0.053 Protein intake (g/day) 1.2 (0.4) 0.6 0.013 Gestational age (weeks) −0.6 (0.2) −0.5 0.025 Protein intake model 2: 0.625 0.017 Constant 10.2 (7.6) 0.209 Protein intake (g/day) 0.5 (0.8) 0.2 0.561 Gestational age (weeks) −0.5 (0.2) −0.4 0.089 Weight (grams) 0.004 (0.003) 0.4 0.289 Carbohydrate intake model 1: 0.593 0.014 Constant 9.1 (7.8) 0.268 Carbohydrate intake (g/day) 0.3 (0.1) 0.6 0.022 Gestational age (weeks) −0.4 (0.3) −0.4 0.111 Carbohydrate intake model 2: 0.690 0.007 Constant 5.5 (6.9) 0.444 Carbohydrate intake (g/day) 0.2 (0.1) 0.3 0.144 Gestational age (weeks) −0.4 (0.2) −0.3 0.113 Weight (grams) 0.004 (0.002) 0.5 0.052 Fat intake model 1: 0.581 0.008 Constant 12.3 (6.9) 0.102 Fat intake (g/day) 1.1 (0.4) 0.6 0.012 Gestational age (weeks) −0.6 (0.2) −0.5 0.034 Fat intake model 2: 0.631 0.015 Constant 9.4 (7.2) 0.225 Fat intake (g/day) 0.5 (0.7) 0.3 0.494 Gestational age (weeks) −0.5 (0.3) −0.4 0.083 Weight (grams) 0.003 (0.003) 0.4 0.273 IGF-1: Insulin-like growth factor 1.
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