Sleep quality in stable chronic obstructive pulmonary disease patients in Zagazig University Hospitals, Egypt

The Egyptian Journal of Bronchology

Table 1 Demographic data of the studied patients

		Group I COPD patients with good sleep quality (n = 20)	Group II COPD patients with poor sleep quality (n = 40)	Test of significance
Age (years) (mean ± SD)		56.85 ± 7.13	59.27 ± 8.18	t = − 1.12
Age (years) (mean ± SD)		56.85 ± 7.13	59.27 ± 8.18	P = 0.264
Sex	Male No. (%)	11 (55%)	31 (77.5%)	χ² = 3.21
	Male No. (%)	11 (55%)	31 (77.5%)	P = 0.073
	Female No. (%)	9 (45%)	9 (22.5)	P = 0.073
Smoking	Smoker No (%)	8 (40%)	28 (70%)	χ² = 7.81
	Smoker No (%)	8 (40%)	28 (70%)	P = 0.005
	Non-smoker No (%)	12 (60%)	12 (30%)	P = 0.005