Table 5.
Adjusted odds ratios for class membership according to maternal and paternal BMI and their interaction.
| Lower normal weight (referent) | Higher normal weight | Normal weight increasing to overweight | Overweight decreasing to normal weight | Overweight increasing to obesity | ||
|---|---|---|---|---|---|---|
| OR (95% CI) | OR (95% CI) | OR (95% CI) | OR (95% CI) | |||
| Boys | ||||||
| Model 1 | Mothers BMI (kg/m2) | – | 1.12 (1.07, 1.17) | 1.15 (1.12, 1.18) | 1.11 (1.07, 1.15) | 1.24 (1.20, 1.28) |
| Fathers BMI (kg/m2) | – | 1.07 (1.02, 1.12) | 1.16 (1.12, 1.20) | 1.11 (1.05, 1.17) | 1.20 (1.16, 1.25) | |
| Interaction | – | 0.99 (0.98, 1.01) | 1.00 (0.99, 1.00) | 1.00 (0.98, 1.01) | 0.99 (0.98, 1.00) | |
| RERI | −0.20 (−0.26, −0.13) | −0.32 (−0.36, −0.27) | −0.22 (−0.29, −0.15) | −0.45 (−0.51, −0.38) | ||
| Girls | ||||||
| Model 2 | Mothers BMI (kg/m2) | – | 1.12 (1.08, 1.17) | 1.22 (1.18, 1.26) | 1.17 (1.13, 1.21) | 1.28 (1.24, 1.33) |
| Fathers BMI (kg/m2) | – | 1.09 (1.05, 1.14) | 1.19 (1.15, 1.24) | 1.14 (1.09, 1.19) | 1.28 (1.22, 1.34) | |
| Interaction | – | 0.99 (0.98, 1.00) | 1.00 (0.99, 1.01) | 1.00 (0.99, 1.01) | 1.00 (0.99, 1.01) | |
| RERI | −0.23 (−0.29, −0.16) | −0.40 (−0.46, −0.34) | −0.31 (−0.37, −0.25) | −0.56 (−0.64, −0.49) | ||
Odds ratios weighted by estimated class probabilities using the 3-step BCH approach in Mplus, using FIML to handle missing data.
Models adjusted for ethnicity, maternal and paternal age, tenure, occupational class, maternal age left full-time education, and birth cohort.
Mothers BMI and Fathers BMI were each grand mean centred before computing the interaction term.
RERI relative excess risk due to interaction.