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Table 2 Pulmonary functions and arterial blood gasses of studied groups

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

   Case Control P value
N = 40 N = 30
FEV1 Range
Mean ± SD
23–67
45.8 ± 13.9
77–110
92.7 ± 10.1
< 0.001*
FVC Range
Mean ± SD
23–99
70.5 ± 21.1
80–95
88 ± 4.2
< 0.001*
FEV1\FVC ratio Range
Mean ± SD
21–67
43.8 ± 13.5
70–99
87.7 ± 8.7
< 0.001*
pH Range
Mean ± SD
7.3–7.5
7.4 ± 0.1
7.3–7.5
7.4 ± 0.04
0.451
pO2 Range
Mean ± SD
45–89
63.2 ± 11.6
76–90
85.7 ± 3.6
< 0.001*
pCO2 Range
Mean ± SD
33–76
52.2 ± 12.8
33–39
35.6 ± 2
< 0.001*
HCO3 Range
Mean ± SD
21–35
29.3 ± 4.1
23–28
25.4 ± 1.3
< 0.001*
SO2 Range
Mean ± SD
75–93
82.4 ± 5.6
94–98
96.3 ± 1.2
< 0.001*
  1. Independent samples T test for parametric quantitative data between the two groups
  2. Mann-Whitney test for non-parametric quantitative data between the two groups
  3. * Significance level at P value < 0.05