The interaction analysis between birth weight and lifestyle factors of overweight/obesity across gender and educational stage groups
| Variables | Birth weight | Adjusted OR (95% CI) | IOR (95% CI) | RERI (95% CI) | AP (95% CI) |
| Boys | |||||
| Physical activity time | 2.926 (1.123 to 4.758) | 1.932 (0.528 to 2.976) | 0.691 (0.425 to 1.112) | ||
| ≤2 hours/day | Non-HBW | 1.00 (reference)* | |||
| ≤2 hours/day | HBW | 2.218 (1.176 to 3.125) | |||
| Screen time | 1.135 (−0.567 to 2.642) | 0.875 (−1.927 to 4.686) | 0.512 (−0.367 to 2.013) | ||
| ≤2 hours/day | Non-HBW | 1.00 (reference)* | |||
| ≤2 hours/day | HBW | 1.556 (0.483 to 1.812) | |||
| Girls | |||||
| Physical activity time | 2.875 (1.201 to 4.692) | 1.867 (0.471 to 2.623) | 0.564 (0.378 to 1.085) | ||
| ≤2 hours/day | Non-HBW | 1.00 (reference)* | |||
| ≤2 hours/day | HBW | 2.057 (1.268 to 2.974) | |||
| Screen time | 1.096 (−0.459 to 2.367) | 0.773 (−1.876 to 4.592) | 0.469 (−0.287 to 1.978) | ||
| ≤2 hours/day | Non-HBW | 1.00 (reference)* | |||
| ≤2 hours/day | HBW | 1.473 (0.369 to 1.721) | |||
| Primary school | |||||
| Physical activity time | 2.763 (1.125 to 4.396) | 2.216 (0.591 to 3.435) | 0.528 (0.317 to 1.092) | ||
| ≤2 hours/day | Non-HBW | 1.00 (reference)* | |||
| ≤2 hours/day | HBW | 1.857 (1.033 to 2.869) | |||
| Screen time | 0.873 (−0.435 to 1.964) | 0.615 (−1.514 to 3.979) | 0.346 (−0.612 to 1.369) | ||
| ≤2 hours/day | Non-HBW | 1.00 (reference)* | |||
| ≤2 hours/day | HBW | 1.258 (0.362 to 1.475) | |||
| Middle school | |||||
| Physical activity time | 2.829 (1.214 to 4.673) | 2.357 (0.634 to 3.891) | 0.619 (0.298 to 1.147) | ||
| ≤2 hours/day | Non-HBW | 1.00 (reference)* | |||
| ≤2 hours/day | HBW | 1.932 (1.145 to 2.906) | |||
| Screen time | 0.956 (−0.527 to 2.105) | 0.756 (−2.357 to 4.521) | 0.472 (−0.721 to 1.613) | ||
| ≤2 hours/day | Non-HBW | 1.00 (reference)* | |||
| ≤2 hours/day | HBW | 1.347 (0.453 to 1.562) | |||
| High school | |||||
| Physical activity time | 3.026 (1.311 to 4.857) | 2.432 (0.756 to 4.123) | 0.711 (0.435 to 1.289) | ||
| ≤2 hours/day | Non-HBW | 1.00 (reference)* | |||
| ≤2 hours/day | HBW | 2.031 (1.216 to 3.217) | |||
| Screen time | 1.038 (−0.586 to 2.397) | 0.837 (−3.126 to 4.275) | 0.512 (−0.829 to 1.497) | ||
| ≤2 hours/day | Non-HBW | 1.00 (reference)* | |||
| ≤2 hours/day | HBW | 1.412 (0.556 to 1.639) | |||
| Overall | |||||
| Physical activity time | 3.192 (1.071 to 5.678) | 2.289 (0.678 to 3.576) | 0.723 (0.521 to 1.126) | ||
| ≤2 hours/day | Non-HBW | 1.00 (reference)* | |||
| ≤2 hours/day | HBW | 2.165 (1.352 to 3.378) | |||
| Screen time | 1.157 (−0.642 to 2.853) | 0.986 (−3.536 to 5.728) | 0.367 (−0.973 to 1.562) | ||
| ≤2 hours/day | Non-HBW | 1.00 (reference)* | |||
| ≤2 hours/day | HBW | 1.362 (0.579 to 1.658) |
*1.00 (reference) meant the reference group.
AP, attributable proportion; HBW, high birth weight; IOR, interaction of OR; RERI, relative excess risk due to interaction.