Fig. 2

Forest plot of Mendelian randomization analyses for the associations of smoking initiation and lifetime smoking with risk of rheumatoid arthritis. CI, confidence interval; MR, Mendelian randomization; MR-PRESSO test, MR-Pleiotropy RESidual Sum and Outlier test; OR, odds ratio; SNP, single nucleotide polymorphism. ^aP value of the intercept from MR-Egger regression analysis