Fig. 1

The process of present Mendelian randomization (MR) analyses is shown in flow chart
Assumption 1: The instrumental variables (IVs) selected for this study should demonstrate a significant association with epigenetic age. Assumption 2: The IVs chosen for present study are required to have no significant associations with other potential confounding factors. Assumption 3: The IVs utilized in present study do not have any independent causal pathways leading to multiple sclerosis other than through epigenetic age acceleration
Abbreviations: IV, instrumental variable; SNPs, single-nucleotide polymorphisms; MR, Mendelian randomization