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. 2014 Feb 27;146(2):406–411. doi: 10.1378/chest.13-2281

TABLE 1 .

] Demographic Characteristics of the Study Population

Variable No. %
Sex
 Female 30 34
 Male 58 66
Ethnicity
 White 68 77
 Black 20 23
Smoking status
 Current 18 20
 Former 65 74
 Never 5 6
History of cancer
 No 43 49
 Yes 45 51