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Table 1 Characteristics of cases and controls

From: Fc receptor-like 1, 3, and 6 variants are associated with rheumatoid arthritis risk in the Chinese Han population

Variables Cases (n = 506) Controls (n = 509) p
Age, years (mean ± SD) 59.80 ± 9.08 59.80 ± 10.63 0.038*
  ≤ 54 262 (51.78%) 260 (51.08%)  
  > 54 244 (48.22%) 249 (48.92%)  
Gender    0.958
 Male 135 (26.68%) 134 (26.33%)  
 Female 371 (73.32%) 375 (73.67%)  
Clinical parameters
 CRP (mg/L) 31.05 ± 40.25   
 RF (KIU/L) 164.09 ± 147.21   
 ESR (mm/h) 44.28 ± 30.86   
 CCP (RU/ml) 75.11 ± 60.78   
  1. SD: standard deviation; RA: rheumatoid arthritis; SD: standard deviation; CRP: C-reaction protein; RF: rheumatoid factor; ESR: erythrocyte sedimentation rate; CCP: anti-cyclic citrullinated peptide
  2. p values were calculated from χ2 test
  3. *p < 0.05 indicates statistical significance