Table 1. Demographics of the study groups
	Asthma	COPD	Overlap	p
n	205	118	85
Age (years, mean ± SD)	50.7 ± 11	63.2 ± 8.7	59.7 ± 10.9	<0.001
Sex (F/M)	164/41 (80/20%)	14/104 (11.9/88.1%)	27/58 (31.8/68.2%)	<0.001
Education				0.04
Illiterate	13 (6.4%)	4 (3.4%)	3 (3.5%)
Primary school	89 (43.4%)	51 (44.1%)	39 (45.9%)
Secondary school	20 (9.8%)	23 (19.5%)	10 (11.8%)
High school	42 (20.6%)	27 (22.9%)	17 (20%)
University	40 (19.6%)	12 (10.2%)	16 (18.8%)
BMI				<0.001
Lean-Normal	41 (20%)	50 (42.4%)	26 (30.6%)
Overweight	71 (34.6%)	46 (39%)	32 (37.6%)
Obese	93 (45.4%)	22 (18.6%)	27 (31.8%)
Occupation				<0.001
Housewife	104 (50.7%)	6 (5.1%)	18 (21.2%)
Working at any job	44 (21.5%)	5 (4.2%)	7 (8.2%)
Retired	32 (15.6%)	84 (71.2%)	45 (52.9%)
Other	25 (12.2%)	23 (19.5%)	15 (17.7%)
Smoking status				<0.001
Non-smokers	145 (70.7%)	12 (10.1%)	23 (27.1%)
Ex-smoker	49 (23.9%)	89 (75.4%)	51 (60%)
Current smoker	11 (5.4%)	17 (14.4%)	11 (12.9%)