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Table 1 Subject characteristics in relation to smoking status

From: Effect of the G-308A polymorphism of the tumor necrosis factor (TNF)-α gene promoter site on plasma levels of TNF-α and C-reactive protein in smokers: a cross-sectional study

  Smoking status  
Variable Non-smokers for >6 months n = 198 Irregular smokers n = 24 Regular smokers n = 78 P-valuea
Gender [% male] 86 80 88 0.52
Age [years] 42.1 ± 9.0 40.6 ± 9.2 40.0 ± 9.6 0.09
LDL [mg/dl] 122.3 ± 28.5 117.4 ± 30.4 115.9 ± 28.3 0.10
HDL [mg/dl] 45.3 ± 10.8 47.1 ± 8.3 41.4 ± 9.2 0.01
Systolic blood pressure [mmHg] 132.9 ± 15.2 128.7 ± 9.9 131.2 ± 13.6 0.43
Diastolic blood pressure [mmHg] 82.9 ± 9.7 79.2 ± 8.0 81.6 ± 8.3 0.33
Glycosylated hemoglobin [%] 5.15 ± 0.5 5.1 ± 0.4 5.25 ± 0.4 0.12
Tumor necrosis factor-α [ng/l] 1.8 ± 0.5 1.8 ± 1.0 2.2 ± 2.5 0.61
C-reactive protein [mg/l] 1.0 (0.47–1.9) 0.80 (0.5–2.0) 1.75 (0.7–3.0) 0.006
  1. a P-values for comparisons between non-smokers and regular smokers. Tumor necrosis factor-α and C-reactive protein (CRP) levels were compared using the Wilcoxon test; for all other continuous variables the Student t-test was employed. Values are means ± SD except for CRP where the median and interquartile range is provided. LDL = Low-density lipoprotein cholesterol, HDL = High-density lipoprotein cholesterol