Table 3.
Associations between weight 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 | |
|---|---|---|---|---|
| Weight SDS 4 wks PNA | 0.57 (0.37 to 0.72) | 0.75 (0.60 to 0.84) | 2.2 (0.4 to 4.0)a | −2.2 (−4.0 to −0.4)b |
| Weight SDS 36 wks PMA | 0.64 (0.46 to 0.78) | 0.82 (0.71 to 0.89) | 1.8 (0.5 to 3.1)c | −1.8 (−3.1 to −0.5)d |
| Weight SDS Term age | 0.62 (0.42 to 0.76) | 0.62 (0.42 to 0.76) | 1.7 (0.7 to 2.8)e | −1.7 (−2.8 to −0.7)f |
| Change in weight SDS birth— 4 wks PNA | −0.54 (−0.70 to −0.32) | −0.72 (−0.82 to −0.57) | −198.9 (−383.3 to −14.6)g | 200.9 (12.1 to 389.6)h |
| Change in weight SDS birth—36 weeks PMA | 0.57 (0.37 to 0.72) | 0.68 (0.51 to 0.80) | 32.3 (9.2 to 55.5) i | −32.9 (−56.6 to −9.1)j |
| Change in weight SDS from 30 weeks PMA onwards | 0.77 (0.65 to 0.86) | 0.72 (0.56 to 0.82) | 52.4 (34.7 to 70.1)k | −53.9 (−72.0 to −35.9)l |
All associations 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 0.176, P 0.015; b R2 0.179, P 0.013; c R2 0.199, P 0.009; d R2 0.202, P 0.008; e R2 0.210, P 0.008; f R2 0.210, P 0.008; g R2 0.151, P 0.028; h R2 0.154, P 0.026; i R2 0.193, P 0.008; j R2 0.197, P 0.007; k R2 0.438, P < 0.001; l R2 0.445, P < 0.001.