Table 2.
Unadjusted and adjusted differences* (95% CI) in infant anthropometry per year of increasing maternal age
| Parity 0 |
Parity 1 |
|||
|---|---|---|---|---|
| Unadjusted | Adjusted† | Unadjusted | Adjusted† | |
| Birthweight (g) | 19.8 (7.6, 31.9) | 9.0 (−2.1, 21.8) | −8.7 (−23.4, 6.0) | −10.3 (−25.2, 4.5) |
| Birth length (cm) | 0.13 (0.05, 0.20) | 0.07 (−0.01, 0.16) | −0.02 (−0.10, 0.06) | −0.04 (−0.12, 0.04) |
| Head circumference (cm) | 0.07 (0.03, 0.12) | 0.05 (0.01, 0.09) | −0.03 (−0.08, 0.02) | −0.04 (−0.09, 0.02) |
| Chest circumference (cm) | 0.11 (0.05, 0.16) | 0.07 (0.01, 0.12) | −0.04 (−0.11, 0.02) | −0.05 (−0.12, 0.03) |
| Ponderal index (kg m−3) | −0.02 (−0.09, 0.05) | −0.04 (−0.11, 0.03) | −0.05 (−0.14, 0.03) | −0.05 (−0.14, 0.03) |
*
Differences (95% CI) calculated using linear regression.
†
Adjusted estimates control for maternal BMI and height in the first trimester, ethnicity, smoking and literacy. Confidence intervals were calculated using a robust estimation of the variance. BMI, body mass index.