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Table 2 Patients demographics and parameter scores for rheumatoid hand deformities in each cluster

From: Comprehensive assessment of alterations in hand deformities over 11 years in patients with rheumatoid arthritis using cluster analysis and analysis of covariance

  Cluster 1 Cluster 2 Cluster 3 Cluster 4 Cluster 5
Patients’ demographics
 N 49 46 12 8 17
 age (year) 64.0 (9.9) 61.2 (9.3) 62.5 (8.4) 51.3 (10.2)$ 63.8 (7.6)**
 disease duration (year) 16.2 (8.4) 17.1 (7.2) 19.7 (7.6) 17.4 (6.2) 25.5 (10.8)*, ***
 Kapandji Index 34.4 (10.9) 35.8 (9.3) 30.5 (7.4) 25.8 (6.6) 22.5 (8.9)*, ***
Deformity parameters
 Swan-neck deformity 1.6 (0.3) 1.4 (0.2) 1.6 (0.6) 1.9 (0.5) 12.1 (0.8)%
 Boutonnière deformity 1.2 (2.0) 0.2 (0.7) 5.3 (2.7)# 1.4 (2.7) 0.0 (0.0)
 Ulnar drift 2.9 (2.7) 3.7 (2.6) 3.4 (1.1) 6.6 (1.4)% 3.6 (1.7)
  1. Numbers express the mean (standard deviation). Analysis of variance with post-hoc Bonferroni was performed for multiple comparison
  2. *: p < 0.05; cluster 1 and 5, **: p < 0.05; cluster 4 and 5, ***: p < 0.05; cluster 2 and 5, $: p < 0.05, cluster 1 and 4
  3. %: p < 0.05, against all the other clusters, #: p < 0.05, against cluster 1, 2, and 4