103 IGF-I, growth and body composition in preterm infants 5 Table 6. Predictive value of growth for fat free mass percentage at term equivalent age B (SE) ß p-value Model 1 weight gain Constant 98.9 (9.8) < 0.001 PMA (weeks) -0.4 (0.2) -0.22 0.056 Change in weight SDS from 30 weeks PMA onwards (SDS per week) -55.7 (9.4) -0.67 < 0.001 Model 2 length gain Constant 87.0 (14.6) < 0.001 PMA (weeks) -0.6 (0.3) -0.29 0.031 Gestational age (weeks) 0.6 (0.3) 0.25 0.064 Length SDS at term equivalent age -1.7 (0.6) 0.58 0.005 Model 3 head circumference growth Constant 106.1 (11.4) < 0.001 PMA (weeks) -0.6 (0.3) -0.28 0.033 Head circumference SDS at 36 weeks PMA -1.4 (0.6) -0.31 0.020 Change in head circumference SDS from 30 weeks PMA onwards -23.1 (8.9) -0.33 0.013 PMA: postmenstrual age Model 1: R² = 0.425, p < 0.001 Backward regression model. Variables not included in the final model: gestational age at birth, week 4 weight SDS, change in weight SDS from birth to week 4, weight SDS at 36 weeks PMA, change in weight SDS from birth to 36 weeks PMA, weight SDS at term equivalent age. Model 2: R² = 0.260, p 0.010 Backward regression model. Variables not included in the final model: Length z-score at 36 weeks postmenstrual age. Model 3: R² = 0.280, p 0.014 Backward regression model. Variables not included in the final model: gestational age at birth, head circumference SDS at term equivalent age.
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