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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%)