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Table 1 Relationships between seropositivity for Q fever and characteristics of control subjects

From: Lack of association between serological evidence of past Coxiella burnetii infection and incident ischaemic heart disease: nested case-control study

   Mean (SD) p-value
   Seronegative Seropositive  
Age (years)   55.2 (2.69) 54.9 (3.11) 0.45
Total cholesterol   2.23 (0.42) 2.15 (0.31) 0.20
HDL   0.48 (0.12) 0.48 (0.15) 0.69
Triglycerides*   1.37 (1.72) 1.35 (1.68) 0.81
Fibrinogen   3.37 (0.98) 3.53 (1.10) 0.16
CRP*   1.39 (2.73) 1.32 (2.01) 0.76
IL-6*   1.53 (1.97) 1.39 (2.73) 0.14
   Number (%) Number (%)  
Smoking never smoked 223 (25.8) 14 (18.2)  
  ex-smoker 360 (41.6) 38 (49.4)  
  current smoker < 20/day 164 (18.9) 11 (14.3)  
  current smoker ≥ 20/day 118 (13.6) 14 (18.2) 0.21
  1. * geometric mean