Table 2: Bivariate analysis of categorical variables.

CharacteristicRA with AITDRA without AITDOR95% CIP

MAS10/61 (16.39)7/650 (1.08)18.016.57–49.30<0.0001
Type 2 Diabetes12/72 (16.67)20/665 (3.01)6.453.00–13.830.008
Methotrexate75/78 (96.15)627/716 (87.57)3.541.09–11.490.024
Female72/78 (92.31)575/719 (79.97)3.011.2–7.050.008
Thrombosis9/71 (12.68)30/667 (4.50)3.011.4–6.780.003
Anti La+6/39 (15.38)14/246 (5.69)3.011.08–8.30.04*
Anti Ro+11/39 (28.21)32/248 (12.90)2.651.20–5.840.013
Abnormal BMI37/69 (53.60)250/612 (40.8)1.671.01–2.760.042
Low educational level15/59 (25.4)249/633 (39.3)0.520.28–0.960.035
Abnormal cholesterol17/43 (39.53)162/290 (55.86)0.510.26–0.990.045
RF+50/73 (68.49)523/644 (81.21)0.500.29–0.850.01
Polyautoimmunity78/78 (100)35/722 (4.8)N/AN/AN/A
TPOAb+51/54 (94.44)0/81 (0.00)N/AN/AN/A
TgAb+26/50 (52.00)0/75 (0.00)N/AN/AN/A

Fisher’s exact test.
95% CI: 95% confidence interval; AITD: autoimmune thyroid disease; BMI: body mass index; N/A: not assessed; OR: odds ratio; RA: rheumatoid arthritis; RF: rheumatoid factor; TgAb: anti-thyroglobulin; TPOAb: anti-thyroperoxidase enzyme.