FEV1/FVC, forced expiratory volume in 1 s/forced vital capacity; MR
2SLS, Mendelian randomization two-stage least square; OR, odds ratio;
CI, confidence interval; SNP, single-nucleotide polymorphism.
Observational models were cross-sectional logistic models which were
adjusted for age, sex, parental education, and family income.
Odds ratios and beta values were estimated using the interquartile range
increase of obesity-related factors.