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Table 4 Logistic regression for parous women compared to nulliparous women

From: Parity influences the severity of ACPA-negative early rheumatoid arthritis: a cohort study based on the Swedish EIRA material

Outcome measure above median ACPA-negative RA
Aged 18 − 44 Aged 45 − 70
  OR (95 % CI), p-value OR (95 % CI), p-value
DAS28   
 Baseline 1.87 (0.62 to 5.69), p = 0.27 0.37 (0.18 to 0.80), p = 0.011
 3 months 4.96 (1.37 to 18.1), p = 0.015 0.51 (0.24 to 1.08), p = 0.08
 6 months 2.66 (0.78 to 9.15), p = 0.12 0.37 (0.16 to 0.85), p = 0.018
 12 months 4.49 (1.37 to 14.7), p = 0.013 0.89 (0.44 to 1.77), p = 0.97
 24 months 3.56 (1.07 to 11.9), p = 0.039 0.67 (0.30 to 1.50), p = 0.33
HAQ   
 Baseline 0.58 (0.20 to 1.69), p = 0.32 0.53 (0.26 to 1.07), p = 0.08
 3 months 3.04 (0.90 to 10.3), p = 0.07 1.29 (0.62 to 2.67), p = 0.50
 6 months 2.42 (0.71 to 8.23), p = 0.16 1.01 (0.47 to 2.14), p = 0.99
 12 months 7.92 (2.02 to 31.0), p = 0.003 1.15 (0.57 to 2.33), p = 0.69
 24 months 2.14 (0.65 to 7.06), p = 0.21 0.95 (0.42 to 2.17), p = 0.90
  1. Logistic regression adjusted for age at inclusion in the Epidemiological Investigation of Rheumatoid Arthritis (EIRA), with the odds ratio (OR) of having an outcome measure (DAS28 and HAQ) higher than median for a parous woman. ACPA Anti-citrullinated protein antibody, CI confidence interval, DAS28 Disease activity score 28, HAQ Health assessment questionnaire