Table 1. FEV1 decline dependent on starting value

ΔFEV1 (mls)  
 Smoker/Ex-smokerNever smoked
FEV1 <50%n=15 -80 (-290 to 320)N/A
FEV1 >50%n=14 -150 (-480 to 310)n=9 -130 (-550 to 210)