In detail, in the overall analysis and the remaining strata, the first quartile was equal to 0.032 (1 serving of mozzarella, 1 time/month) vs. 0.065 (1 serving of mozzarella, 2 times/month) in the RA duration ≤15 years, or the RF- and ACPA-negative strata. This evidence concerns the gene PRTN3 and rheumatoid arthritis.