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Table 2 Anti-CCP levels by gender, age, year of birth, and smoking status

From: Linkage analysis of anti-CCP levels as dichotomized and quantitative traits using GAW15 single-nucleotide polymorphism scan of NARAC families

Covariate Values N anti-CCP mean SD t test P
Sex Female 1153 112.19 102.58 <0.001
  Male 346 143.24 100.19  
Age of onset <40 758 119.70 97.53  
  ≥40 722 119.89 108.01 nsa
Year of birth <1944 754 119.34 97.53  
  ≥1944 738 119.50 108.01 ns
Smoking Never 618 110.54 100.38  
  Ever 832 126.13 104.91 0.004
  Current 244 119.84 105.32  
  Never or former 1211 119.44 102.79 ns
  1. ans, not significant