Univariate GEE analysis showed that compared with RIS, AID (odds ratio (OR) = 1.72, 95% CI: 1.22–2.42, p = 0.002, Table 2) and FID (OR = 1.93, 95% CI: 1.43–2.60, p < 0.001) were positively associated with the occurrence of peritonitis. This evidence concerns the gene AICDA and peritonitis.