Table 3.

Baseline and demographic data

Characteristic		Population (N = 161)
Age, mean (SD) years		49.2 (17.5)
Sex, n (%)	Male Female	73 (45.3) 88 (54.7)
Race, n (%)	White Black	157 (97.5) 4 (2.5)
Level of education, n (%)	No education Primary education Secondary education Higher education	4 (2.5) 59 (36.6) 51 (31.7) 47 (29.2)
Employment status, n (%)	Employed Unemployed Retired Homemaker	86 (53.4) 15 (9.3) 43 (26.7) 17 (10.6)
Diagnosis, n (%)	Asthma COPD	138 (85.7) 23 (14.3)

COPD: chronic obstructive pulmonary disease; SD: standard deviation.