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 |
Abbreviation: 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.