Table 5

The interaction analysis between birth weight and lifestyle factors of overweight/obesity across gender and educational stage groups

VariablesBirth weightAdjusted OR (95% CI)IOR (95% CI)RERI (95% CI)AP (95% CI)
Boys
Physical activity time2.926 (1.123 to 4.758)1.932 (0.528 to 2.976)0.691 (0.425 to 1.112)
 ≤2 hours/dayNon-HBW1.00 (reference)*
 ≤2 hours/dayHBW2.218 (1.176 to 3.125)
Screen time1.135 (−0.567 to 2.642)0.875 (−1.927 to 4.686)0.512 (−0.367 to 2.013)
 ≤2 hours/dayNon-HBW1.00 (reference)*
 ≤2 hours/dayHBW1.556 (0.483 to 1.812)
Girls
Physical activity time2.875 (1.201 to 4.692)1.867 (0.471 to 2.623)0.564 (0.378 to 1.085)
 ≤2 hours/dayNon-HBW1.00 (reference)*
 ≤2 hours/dayHBW2.057 (1.268 to 2.974)
Screen time1.096 (−0.459 to 2.367)0.773 (−1.876 to 4.592)0.469 (−0.287 to 1.978)
 ≤2 hours/dayNon-HBW1.00 (reference)*
 ≤2 hours/dayHBW1.473 (0.369 to 1.721)
Primary school
Physical activity time2.763 (1.125 to 4.396)2.216 (0.591 to 3.435)0.528 (0.317 to 1.092)
 ≤2 hours/dayNon-HBW1.00 (reference)*
 ≤2 hours/dayHBW1.857 (1.033 to 2.869)
Screen time0.873 (−0.435 to 1.964)0.615 (−1.514 to 3.979)0.346 (−0.612 to 1.369)
 ≤2 hours/dayNon-HBW1.00 (reference)*
 ≤2 hours/dayHBW1.258 (0.362 to 1.475)
Middle school
Physical activity time2.829 (1.214 to 4.673)2.357 (0.634 to 3.891)0.619 (0.298 to 1.147)
 ≤2 hours/dayNon-HBW1.00 (reference)*
 ≤2 hours/dayHBW1.932 (1.145 to 2.906)
Screen time0.956 (−0.527 to 2.105)0.756 (−2.357 to 4.521)0.472 (−0.721 to 1.613)
 ≤2 hours/dayNon-HBW1.00 (reference)*
 ≤2 hours/dayHBW1.347 (0.453 to 1.562)
High school
Physical activity time3.026 (1.311 to 4.857)2.432 (0.756 to 4.123)0.711 (0.435 to 1.289)
 ≤2 hours/dayNon-HBW1.00 (reference)*
 ≤2 hours/dayHBW2.031 (1.216 to 3.217)
Screen time1.038 (−0.586 to 2.397)0.837 (−3.126 to 4.275)0.512 (−0.829 to 1.497)
 ≤2 hours/dayNon-HBW1.00 (reference)*
 ≤2 hours/dayHBW1.412 (0.556 to 1.639)
Overall
Physical activity time3.192 (1.071 to 5.678)2.289 (0.678 to 3.576)0.723 (0.521 to 1.126)
 ≤2 hours/dayNon-HBW1.00 (reference)*
 ≤2 hours/dayHBW2.165 (1.352 to 3.378)
Screen time1.157 (−0.642 to 2.853)0.986 (−3.536 to 5.728)0.367 (−0.973 to 1.562)
 ≤2 hours/dayNon-HBW1.00 (reference)*
 ≤2 hours/dayHBW1.362 (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.