Table 1: Demographics of the 21 patients with reversible restrictive spirometry.

Age (years)*65 ± 9
Gender (M/F)15/6
Race
 Caucasian18 (86%)
 African-American3 (14%)
Smokers ( , %)
 Current7 (33%)
 Ex-smoker8 (38%)
 Never6 (29%)
Pack-year*51 ± 29
Body mass index (kg/m2)*31 ± 7

Data expressed as mean ± SD.