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Table 2 General and clinical characteristic in the COPD patients and control group

From: Evaluation of DNA damage in COPD patients and its correlation with polymorphisms in repair genes

  COPD Control pvalue for
  n = 51 n = 51 Mann–Whitney test
Gender (male) 30 28 >0.05
Ethnicity (white) 45 50 >0.05
Age (years)a 65.33 ± 8.91 63.61 ± 9.40 >0.05
BMI (kg/m2)a 25.75 ± 5.71 26.82 ± 3.89 >0.05
FEV1 (% predicted) 42.90±19.03 86.14±11.72 0.000
FEV1/FVC (% predicted) 67.92±19.58 105.24±70.28 0.000
Smoking Status    
 Never/ Former/ Current 5/ 34/ 12 22/ 25/ 4 χ2 0.000
Cigarettes-yearb    
 Current smoking 8059 (3650–14600) 7026 (3650–10950) >0.05
 Former smoking 10490 (1095–25550) 5621 (1095–14600) 0.003
Smoking Duration    
 >30 years 36 9 χ2 0.000
COPD Statusc    
 Mild 8 - -
 Moderate 16 - -
 Severe 16 - -
 Very Severe 11 - -
  1. n, sample number; aData are presented as mean ± SD; bMedian (minimum-maximum); cCOPD status by GOLD [11] ; BMI, body mass index; χ2, chi-square test.