Table 1.

Demographics of COPD and control subjects.

Variables		COPD (N = 112)	Control (N = 100)
Age (years)		58.7 (26-80)	41.66 (17-66)
Gender	Male	106	65
	Female	06	34
Education status	Illiterate	21	01
	Primary	53	07
	High school	30	32
	Preuniversity	03	04
	University	00	06
	Diploma	00	05
Occupation	Unemployed	08	12
	Labour	59	20
	Agriculture	23	01
	Service	07	40
	Business	08	10
Gastroesophageal reflux	Yes	42	03
	No	72	97
Dry mouth	Yes	64	07
	No	48	93