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Table 1 Personal characteristics in a population-based sample of 2,113 U.S. adults aged 55 to 75 years

From: Lifetime environmental tobacco smoke exposure and the risk of chronic obstructive pulmonary disease

Characteristic COPD (n = 386) No COPD (n = 1,727) P value
Age (years) 64.3 (6.2) 63.9 (6.1) 0.24
Gender (female) 246 (64%) 961 (56%) 0.004
Race-ethnicity (white) 337 (87%) 1495 (87%) 0.70
Married or cohabitating 186 (48%) 1080 (63%) <0.0001
Educational attainment    <0.0001
   High school degree 207 (54%) 709 (41%)  
   Some college 105 (27%) 529 (31%)  
   College or graduate degree 74 (19%) 489 (28%)  
Cigarette smoking    <0.0001
   Current smoker 127 (33%) 279 (16%)  
   Past smoker 184 (48%) 685 (40%)  
   Never smoker 75 (19%) 763 (44%)  
  1. Proportions are column proportions (of those with and without COPD)
  2. P-values from unpaired t-test (age) and likelihood ratio chi-square test