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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)
  1. aDisease severity based on GOLD classification