Table 4 Degree of dyspnea in the cases
From: Chronic obstructive pulmonary disease in non-smokers: role of oxidative stress
| Case | ||
|---|---|---|
| N = 40 | ||
| Degree of dyspnea |
Grade 2 Grade 3 Grade 4 |
6 (15%) 18 (45%) 16 (40%) |