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Table 3 Comparison of the background data of the cases and controls

From: Clinical characteristics of rheumatoid arthritis patients undergoing cervical spine surgery: an analysis of National Database of Rheumatic Diseases in Japan

  Cases Controls p value
Age (years) (IQR) 63(59–73) 63(59–69) 0.7224
Gender (female:male) 35:4 99:7 0.4614
Disease dutaion (years) (IQR) 15(12–30) 15(11–22) 0.52
Arthroplastic surgery (%) 41 31 0.1527
Tender joint count (IQR) 3(1–10) 1(0–4) 0.0087
Swollen joint count (IQR) 2(0–4) 1(0–3) 0.1389
MHAQ (IQR) 1.13(0.75-1.88) 0.5(0.1-1) 0.0001
CRP (mg/dl) (IQR) 1.5(0.26-3.05) 0.36(0.13-1.06) 0.0023
ESR (mm/h) (IQR) 46(21–70) 33(20.5-57.5) 0.1948
DAS28-CRP (IQR) 3.63(2.60-4.68) 2.81(2.01-3.43) 0.0012
Stage1 (%) 5.3 6.5  
Stage2 (%) 13.2 19.6  
Stage3 (%) 18.4 19.6  
Stage4 (%) 63.1 54.3 0.7823
Class1 (%) 7.9 20.4  
Class2 (%) 47.3 58.1  
Class3 (%) 39.5 18.3  
Class4 (%) 5.3 3.2 0.0395
PtPainVAS (IQR) 3.9(1.8-6.4) 3(1.2-5) 0.0937
PtGVAS (IQR) 4.9(2–6.8) 2.9(1.2-5) 0.0314
DrGVAS (IQR) 3.4(1.4-5.1) 1.6(1–3.1) 0.0121
Use of MTX (%) 13 40 0.0022
Use of corticosteroid (%) 90 60 0.0007
Use of biologics (%) 10 8 0.7414
  1. The data are presented as the median (IQR). P values were calculated using the chi-square test for gender, Steinbrocker functional class and stage and arthroplastic surgery. The Mann–Whitney U test was used for the other items.