IGF1 and asthma: Although the results of MR Egger and weighted median showed that there was no statistically significant between IGF-1 exposure and asthma (OR, 0.995, 95%CI, 0.977-1.013, P=0.595; OR, 0.996, 95% CI, 0.988-1.004, P=0.292, respectively), the direction was in line with the results of the main analysis, especially IVW.