102 Chapter 5 Table 5. Associations between head circumference 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 Head circumference SDS 4 wks PNA 0.23 (-0.05 – 0.47) 0.46 (0.21 – 0.65) 0.3 (-1.0 – 1.5)a -0.2 (-1.5 – 1.0)b Head circumference SDS 36 wks PMA 0.51 (0.25 – 0.70) 0.58 (0.35 – 0.75) 1.4 (0.2 – 2.6)c -1.4 (-2.7 – -0.2)d Head circumference SDS Term age 0.53 (0.31 – 0.70) 0.55 (0.33 – 0.71) 1.7 (0.6 – 2.7)e -1.7 (-2.7 – -0.7)f Change in head circumference SDS birth – 4 wks PNA -0.11 (-0.36 – 0.17) 0.09 (-0.18 – 0.35) -6.5 (-19.5 – 6.5)g 5.8 (-7.5 – 19.2)h Change in head circumference SDS birth – 36 weeks PMA 0.14 (-0.14 – 0.39) 0.20 (-0.08 – 0.44) 5.5 (-7.4 – 18.4) i -6.3 (-19.4 – 6.9)j Change in head circumference SDS from 30 weeks PMA onwards 0.15 (-0.12 – 0.39) 0.00 (-0.27 – 0.27) 17.5 (-0.6 – 35.6)k -19.1 (-37.5 – -0.7)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 0.038, p 0.178; b R² 0.099, p 0.152; c R² 0.129, p 0.029; d R² 0.188, p 0.026; e R2 0.186, p 0.003; f R2 0.193, p 0.002; g R² 0.047, p 0.136; h R² 0.048, p 0.131; i R² 0.069, p 0.079; j R² 0.197, p 0.007; k R² 0.138, p 0.042; l R² 0.104, p 0029;
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