Table 3.
Infant measures at birth, 2 weeks, and 1 year of age
| Intervention | Usual care | |||||
|---|---|---|---|---|---|---|
| Mean (SD)a | n | Mean (SD)a | n | Main Effect of Group [95% CI]b | Difference in Adjusted Meane Change [95% CI] | |
| Weight (kg) | ||||||
| Birth | 3.48 (0.48) | 56 | 3.68 (0.67) | 58 | ||
| 2 weeks of age | 3.89 (0.57) | 55 | 4.15 (0.58) | 57 | -0.02 [-0.17,0.12] | |
| 1 year of age | 9.83 (0.93) | 51 | 10.01 (1.24) | 52 | 0.02 [-0.37,0.41] | |
| -0.20 [-0.38,-0.02]c | ||||||
| Weight for age z-score | ||||||
| Birth | 0.37 (0.98) 64.4%tile | 56 | 0.74 (1.40) 77.0%tile | 58 | ||
| 2 weeks of age | -0.10 (1.02) 46.0%tile | 55 | 0.41 (0.84) 65.9%tile | 57 | -0.03 [-0.23,-0.17] | |
| 1 year of age | 0.37 (0.74) 64.4%tile | 51 | 0.51 (0.94) 69.5%tile | 52 | 0.33 [-0.07, 0.73] | |
| -0.40 [-0.75,-0.05]d | ||||||
| Length (cm) | ||||||
| 2 weeks of age | 52.63 (2.35) | 46 | 53.44 (2.40) | 46 | ||
| 1 year of age | 74.94 (2.71) | 44 | 75.86 (3.51) | 41 | -0.43 [-1.66,0.80] | |
| -0.50 [-1.38,0.39]c | ||||||
| Length for age z-score | ||||||
| 2 weeks of age | -0.17 (1.17) 43.3%tile | 46 | 0.24 (1.10) 59.5%tile | 46 | ||
| 1 year of age | -0.15 (0.97) 44.0%tile | 44 | 0.20 (1.31) 57.9%tile | 41 | -0.01 [-0.51,0.50] | |
| -0.27 [-0.68,0.15]d | ||||||
| Weight for length z-score | ||||||
| 2 weeks of age | -0.16 (1.07) 43.6%tile | 46 | 0.02 (0.91) 50.8%tile | 46 | ||
| 1 year of age | 0.53 (0.72) 70.2%tile | 44 | 0.60 (0.92) 72.6%tile | 41 | 0.10 [-0.35,0.54] | |
| -0.20 [-0.59,0.20]d | ||||||
| Sum of triceps + subscapular skinfold thicknesses (mm) | ||||||
| 2 weeks of age | 16.31 (3.90) | 45 | 15.82 (3.89) | 46 | ||
| 1 year of age | 19.79 (5.18) | 44 | 19.13 (4.00) | 41 | 0.21 [-2.57,2.99] | |
| 0.47 [-1.13, 2.06]c | ||||||
a
Means and standard deviations are crude (observed) values.
b
Main effect of Group refers to the difference between arms collapsed across time (i.e., between-subjects effect) and after adjustment for covariates. These are based on the coefficients for the group term in the GEE model.
c
Controlling for gestational age at birth and gender.
d
Controlling for gestational age at birth. Note: Corresponding percentile given for each Z score measure (%tile)
e
Difference in Adjusted Mean Change is the difference in the change between arms after adjustment for covariates. These are based on the coefficients for the time by group interaction terms in the GEE model.