Table 1 Demographics of sample population (n = 168 participants)
From: Low level air pollution and exacerbation of existing copd: a case crossover analysis
Age (mean years, SD) | 70.1 (9.78) |
Female, % (n) | 60.1 (101) |
Race, % (n) | |
White | 97 % (163) |
Black | 1.2 % (2) |
Other | 1.8 % (3) |
Disease Severity, % (n)a | |
Mild | 1.8 % (3) |
Moderate | 23 % (38) |
Severe | 50 % (82) |
Very Servere | 18 % (30) |
Normal FEV1/FVC with COPD symptoms | 7.1 % (12) |
Inadequate spirometry (missing) | 1.8 % (3) |
Doctor diagnosed asthma, % (n) | 43 % (73) |
Smoking Status, % (n) | |
Current smoker | 19 % (30) |
Ex smoker | 81 % (131) |
Never smoked | 4.2 % (7) |
Pack Years (mean, SD) | 52 (30.89) |