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Table 1 Characteristics of the study population for the chronic obstructive pulmonary disease cohort, among residents of 34 US cities

From: Particulate air pollution and survival in a COPD cohort

  N* %
Events 1039 100
Deaths 593 57.1
Gender   
Male 494 47.5
Female 546 52.5
Race   
White 860 82.8
Black 122 11.7
Other 57 5.5
Age** 76.4 (66.2–89.6)
N days in coronary care** 0.35 (0–2.3)
N days in intensive care** 0.72 (0–4.2)
Secondary or previous diagnoses:   
CHF 205 19.7
Diabetes 133 12.8
Hypertension 287 27.6
Previous admissions:   
Atrial fibrillation 67 6.4
MI 38 3.7
COPD type   
Chronic bronchitis 179 13.9
Emphysema 108 8.4
Chronic airway obstructions 706 55.2
  1. * N divided by 1000.
  2. ** Expressed as Mean (5%–95%)