slightly significantp = 0.04
For men older than 45 years old, A-HgM exposure had a slightly significant increase on MS risk (RR: 1.17, CI: 1.01–1.37, p = 0.04) whereas women older than 45 years exhibited a significant increase of MS incidence compared to control (RR: 1.53, CI: 1.39–1.69, p < 0.001) ( Figure 3 , eTable5).