Table 3.
Mean height and weight by gestational age group and mean height and weight differences compared with children born at 39-41 weeks
| Gestational age at birth (weeks) | |||||
|---|---|---|---|---|---|
| <32 | 32-33 | 34-36 | 37-38 | 39-41 | |
| Height in cm | |||||
| At 3 years: | (n=150) | (n=147) | (n=797) | (n=2701) | (n=9445) |
| Mean (95% CI) | 93.2 (92.2 to 94.1) | 95.2 (94.4 to 96.1) | 95.2 (94.8 to 95.6) | 95.6 (95.4 to 95.8) | 96.0 (95.9 to 96.1) |
| Unadjusted difference (95% CI) | −2.8 (−3.7 to −1.8) | −0.6 (−1.6 to 0.3) | −0.7 (−1.1 to −0.3) | −0.4 (−0.6 to −0.1) | 0 |
| Adjusted difference (95% CI)* | −2.9 (−3.8 to −2.1) | −0.9 (−1.9 to 0.0) | −0.8 (−1.1 to −0.4) | −0.4 (−0.6 to −0.2) | 0 |
| Adjusted for corrected age (95% CI)* | −1.4 (−2.3 to −0.5) | 0.1 (−0.9 to 1.0) | −0.1 (−0.5 to 0.3) | −0.1 (−0.3 to 0.1) | 0 |
| At 5 years: | (n=161) | (n=145) | (n=844) | (n=2817) | (n= 9869) |
| Mean (95% CI) | 107.3 (106.1 to 108.5) | 109.5 (108.4 to 110.6) | 109.8 (109.4 to 110.3) | 110.7 (110.4 to 110.9) | 110.8 (110.7 to 111) |
| Unadjusted difference (95% CI) | −3.4 (−4.6 to −2.3) | −1.2 (−2.3 to −0.1) | −0.9 (−1.4 to −0.4) | −0.1 (−0.4 to 0.1) | 0 |
| Adjusted difference (95% CI)* | −3.1 (−4.1to −2.0) | −1.3 (−2.3 to −0.3) | −0.8 (−1.3 to −0.4) | −0.2 (−0.5 to 0) | 0 |
| Adjusted for corrected age* (95% CI) | −1.7 (−2.7 to −0.6) | −0.4 (−1.4 to 0.6) | −0.2 (−0.7 to 0.2) | 0.1 (−0.2 to 0.3) | 0 |
| Weight in kg | |||||
| At 3 years: | (n=149) | (n=149) | (n=807) | (n=2729) | (n=9570) |
| Mean (95% CI) | 13.9 (13.4 to 14.3) | 14.7 (14.3 to 15.1) | 15.3 (15.0 to 15.5) | 15.4 (15.3 to 15.5) | 15.6 (15.5 to 15.6) |
| Unadjusted difference (95% CI) | −1.5 (−2.0 to −1.1) | −0.7 (−1.1 to −0.3) | −0.2 (−0.4 to 0.0) | −0.1 (−0.2 to 0.0) | 0 |
| Adjusted* difference (95% CI) | −1.6 (−2.0 to −1.2) | −0.8 (−1.2 to −0.4) | −0.2 (−0.5 to 0.0) | −0.1 (−0.2 to 0.0) | 0 |
| Adjusted for corrected age* (95% CI) | −1.1 (−1.5 to −0.7) | −0.5 (−0.9 to −0.1) | 0.0 (−0.3 to 0.2) | 0.0 (−0.1 to 0.1) | 0 |
| At 5 years: | (n=161) | (n=145) | (n=848) | (n=2818) | (n=9864) |
| Mean (95% CI) | 18.3 (17.5 to 19.1) | 18.8 (18.3 to 19.3) | 19.8 (19.4 to 20.1) | 20.1 (19.9 to 20.2) | 20.2 (20.1 to 20.2) |
| Unadjusted difference (95% CI) | −1.7 (−2.5 to −0.9) | −1.1 (−1.7 to −0.6) | −0.3 (−0.6 to 0.0) | −0.1 (−0.2 to 0.1) | 0 |
| Adjusted* difference (95% CI) | −1.7 (−2.4 to −0.9) | −1.2 (−1.7 to −0.7) | −0.3 (−0.6 to −0.1) | −0.1 (−0.3 to 0.0) | 0 |
| Adjusted for corrected age* (95% CI) | −1.1 (−1.9 to −0.4) | −0.9 (−1.3 to −0.4) | −0.1 (−0.4 to 0.2) | 0.0 (−0.2 to 0.2) | 0 |
Means and mean differences are weighted with sampling and non-response weights.
*Adjusted for child’s age at interview, sex, and ethnicity; mother’s age at birth, marital status, education, and occupation; whether child was mother’s firstborn; whether child was ever breast fed; and smoking and drinking during pregnancy.