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Table 2 Values of composite indices of disease activity in patients with rheumatoid arthritis by season in NinJa2016

From: Influence of seasonal changes on disease activity and distribution of affected joints in rheumatoid arthritis

  Total Spring Summer Fall Winter p-value#
n = 12,839 n = 3250 n = 916 n = 1021 n = 7652  
DAS28-CRP 2.3 ± 1.0 2.4 ± 1.1 2.3 ± 1.0 2.2 ± 1.0 2.3 ± 1.0 0.001
SDAI 5.1 [2.1, 9.7] 5.4 [2.1,10.2] 4.8 [1.9, 9.4] 4.3 [1.7, 8.1] 5.1 [2.1, 9.8] < 0.001
CDAI 4.7 [1.8, 9.0] 5.0 [1.9, 9.7] 4.3 [1.6, 8.6] 4.0 [1.5, 7.6] 4.7 [1.9, 9] < 0.001
  1. #Analysis of variance was used for the DAS28-CRP score. The Kruskal-Wallis test was used for the SDAI and CDAI scores. DAS28 Disease Activity Score with 28-joint counts (average value ± standard deviation), SDAI simplified disease activity index (median [interquartile range]), CDAI clinical disease activity index (median [interquartile range])