Table 2.
Mean length, weight, and BMI of term infants and mean length, weight, and BMI differences compared with early-term infants
| Early-term infants, mean (95% CI) | Full-term infants, mean (95% CI) | Unadjusted differences (95% CI) | Adjusted differences (95% CI) | |
| Length, cm | ||||
| Month 0 | 49.9 (49.8 to 50.0) | 50.3 (50.3 to 50.4) | −0.4 (−0.5 to −0.4) | −0.4 (−0.5 to −0.4) |
| Month 1 | 54.4 (54.2 to 54.5) | 54.9 (54.8 to 55.0) | −0.5 (−0.7 to −0.4) | −0.5 (−0.7 to −0.4) |
| Month 3 | 61.5 (61.4 to 61.7) | 61.9 (61.8 to 62.0) | −0.4 (−0.5 to −0.2) | −0.3 (−0.5 to −0.2) |
| Month 6 | 67.9 (67.8 to 68.1) | 68.1 (68.0 to 68.2) | −0.2 (−0.3 to 0.0) | −0.2 (−0.3 to 0.0) |
| Month 8 | 71.6 (71.4 to 71.7) | 71.6 (71.5 to 71.7) | −0.1 (−0.2 to 0.2) | −0.1 (−0.3 to 0.1) |
| Month 12 | 76.5 (76.3 to 76.7) | 76.5 (76.4 to 76.6) | 0.0 (−0.0 to 0.2) | 0.0 (−0.2 to 0.2) |
| Weight, kg | ||||
| Month 0 | 3.25 (3.23 to 3.28) | 3.44 (3.42 to 3.45) | −0.18 (−0.21 to −0.16) | −0.18 (−0.21 to −0.16) |
| Month 1 | 4.67 (4.64 to 4.71) | 4.78 (4.76 to 4.80) | −0.11 (−0.15 to −0.07) | −0.11 (−0.15 to −0.07) |
| Month 3 | 6.78 (6.73 to 6.83) | 6.82 (6.78 to 6.85) | −0.04 (−0.10 to 0.02) | −0.03 (−0.09 to 0.04) |
| Month 6 | 8.53 (8.47 to 8.59) | 8.50 (8.46 to 8.53) | 0.04 (−0.04 to 0.10) | 0.04 (−0.04 to 0.11) |
| Month 8 | 9.40 (9.34 to 9.46) | 9.30 (9.26 to 9.35) | 0.04 (−0.02 to 0.17) | 0.04 (0.01 to 0.18) |
| Month 12 | 10.45 (10.38 to 10.52) | 10.39 (10.35 to 10.44) | 0.06 (−0.02 to 0.14) | 0.06 (−0.03 to 0.15) |
| BMI, kg/m2 | ||||
| Month 0 | 13.05 (12.98 to 13.12) | 13.56 (13.51 to 13.60) | −0.50 (−0.58 to 0.43)* | −0.50 (−0.58 to 0.43)* |
| Month 1 | 15.78 (15.69 to 15.88) | 15.85 (15.79 to 15.90) | −0.06 (−0.17 to 0.04) | NA† |
| Month 3 | 17.88 (17.77 to 17.98) | 17.76 (17.70 to 17.83) | 0.12 (−0.01 to 0.24) | NA† |
| Month 6 | 18.46 (18.36 to 18.56) | 18.30 (18.23 to 18.37) | 0.16 (0.03 to 0.28)* | 0.16 (0.02 to 0.29)* |
| Month 8 | 18.36 (18.26 to 18.45) | 18.16 (18.09 to 18.22) | 0.20 (0.08 to 0.32)* | 0.20 (0.07 to 0.33)* |
| Month 12 | 17.85 (17.75 to 17.94) | 17.73 (17.67 to 17.79) | 0.12 (0.01 to 0.23)* | 0.11 (−0.01 to 0.24) |
Means and mean differences are weighted with participants and cases lost to follow-up weights.
Adjusted for infant’s correct age at visit.
*P<0.05.
†Not applicable to ANCOVA
ANCOVA, analysis of covariance; BMI, body mass index.