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Table 1 Demographic data of all groups

From: Chronic obstructive pulmonary disease in non-smokers: role of oxidative stress

   Case Control P value
N = 40 N = 30
Age Range
Mean ± SD
45–76
60.2 ± 9
46–76
60.9 ± 7.2
0.731
Sex Male
Female
30 (75%)
10 (25%)
16 (53.3%)
14 (46.7%)
0.181
Special habits Non-smokers
Ex-smokers
Current smokers
22 (55%)
18 (45%)
0 (0%)
18 (60%)
12 (40%)
0 (0%)
0.767
  1. Independent samples T test for parametric quantitative data between the two groups
  2. Chi-square test and Fisher exact test for qualitative data between the two groups
  3. *Significance level at P value < 0.05