In the comparison of hematological parameter indicators between the ReA group and the JIA group, the p values of Hb, RDW, N, PLT, L, SII, PLR, NLR, and PWR indicators were all less than 0.05, indicating that the differences between the two groups in these indicators were statistically significant. The gene discussed is GSTM1; the disease is juvenile idiopathic arthritis.