APOE genotypes in RA patients and controls.

ACPA; anti-citrullinated protein antibodies, RF; rheumatoid factor. Frequencies of genotypes were compared between all patients or subsets of patients (i.e. ACPA positive patients) and controls using chi square test.*Odds ratios were calculated using ε3/ε3 as the reference group.ACPA（抗瓜氨酸化蛋白抗体，anti-citrullinated protein antibodies）、RF（类风湿因子，rheumatoid factor）。本研究采用卡方检验（chi square test）比较了全部患者或患者亚组（即ACPA阳性患者）与对照组之间的基因型频率。*以ε3/ε3作为参考组计算优势比（Odds ratios）。