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 to 0.47) | 0.46 (0.21 to 0.65) | 0.3 (−1.0 to 1.5)a | −0.2 (−1.5 to 1.0)b |
| Head circumference SDS 36 wks PMA | 0.51 (0.25 to 0.70) | 0.58 (0.35 to 0.75) | 1.4 (0.2 to 2.6) c | −1.4 (−2.7 to −0.2) d |
| Head circumference SDS Term age | 0.53 (0.31 to 0.70) | 0.55 (0.33 to 0.71) | 1.7 (0.6 to 2.7) e | −1.7 (−2.7 to −0.7) f |
| Change in head circumference SDS birth—4 wks PNA | −0.11 (−0.36 to 0.17) | 0.09 (−0.18 to 0.35) | −6.5 (−19.5 to 6.5)g | 5.8 (−7.5 to 19.2)h |
| Change in head circumference SDS birth—36 weeks PMA | 0.14 (−0.14 to 0.39) | 0.20 (−0.08 to 0.44) | 5.5 (−7.4 to 18.4) i | −6.3 (−19.4 to 6.9)j |
| Change in head circumference SDS from 30 weeks PMA onwards | 0.15 (−0.12 to 0.39) | 0.00 (−0.27 to 0.27) | 17.5 (−0.6 to 35.6)k | −19.1 (−37.5 to −0.7) l |
Associations in bold were statistically significant P < 0.05.
Abbreviations: PMA, postmenstrual age; PNA, postnatal age.
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.