Oxidant-Antioxidant Balance in the Blood of Patients with Chronic Obstructive Pulmonary Disease After Smoking Cessation

Table 1

Patient characteristics.

	Healthy subjects, nonsmoking—control I	COPD patients—control II	COPD patients—study group
Number of subjects	35	35	73
Age (years)	44.7 ± 15.1	49.8 ± 11.1	48.9 ± 11.7
Sex (F/M)	16/19	14/21	33/40
Smoking period (years)	—	31.8 ± 11.1	30.1 ± 13.1
No. of packs/year	—	299.0 ± 66.7	288.7 ± 78.6

COPD: chronic obstructive pulmonary disease.
Data expressed as mean 𝑥±SD.