101 IGF-I, growth and body composition in preterm infants 5 Table 4. Associations between length gain and body composition at term age Fat mass term age r (95% CI)¹ Fat free mass term age r (95% CI)¹ Fat mass percentage term age B (95% CI)² Fat free mass percentage term age B (95% CI)² Length SDS 4 wks PNA 0.34 (0.06 – 0.56) 0.44 (0.18 – 0.64) 0.9 (-0.5 – 2.3)a -0.9 (-2.4 – 0.5)b Length SDS 36 wks PMA 0.54 (0.29 – 0.72) 0.72 (0.53 – 0.84) 1.3 (0.2 – 2.4)c -1.3 (-2.4 – -0.2)d Length SDS Term age 0.60 (0.39 – 0.75) 0.82 (0.70 – 0.89) 1.4 (0.4 – 2.4)e -1.4 (-2.5 – -0.4)f Change in length SDS birth – 4 wks PNA -0.073 (-0.33 – 0.20) -0.03 (-0.30 – 0.24) -6.2 (-32.6 – 20.2)g 5.4 (-21.6 – 32.4)h Change in length SDS birth – 36 weeks PMA 0.13 (-0.14 – 0.39) 0.39 (0.13 – 0.60) 0.2 (-12.9 – 13.4) i -0.4 (-13.9 – 13.0)j Change in length SDS from 30 weeks PMA onwards 0.24 (-0.02 – 0.47) 0.47 (0.23 – 0.65) 13.5 (-16.9 – 43.8)k -14.6 (-45.6 – 16.4)l PMA: postmenstrual age, PNA: postnatal age Associations in bold were statistically significant p < 0.05. ¹ Correlations were controlled for gestational age at birth and postmenstrual age at time of body composition measurement ² Gestational age at birth and postmenstrual age at the time of body composition measurement were entered in the regression model as covariates a R² 0.071, p 0.086; b R² 0.078, p 0.073; c R² 0.152, p 0.016; d R² 0.154, p 0.015; e R2 0.139, p 0.011; f R2 0.188, p 0.010; g R² 0.033, p 0.190; h R² 0.088, p 0.171; i R² 0.047, p 0.138; j R² 0.197, p 0.007; k R² 0.042, p 0.148; l R² 0.049, p 0.124;
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