Table 1. Spirometric parameters in elderly male smokers, both resistant and non-resistant to cigarette smoke.

	Cigarette smoke non-resistant n = 57	Cigarette smoke resistant n = 60	P
FVC %predicted	88.3 (20.4)	99.4 (13.8)	0.0007
FEV1%predicted	73.7 (20.5)	100.2 (13.2)	<0.0001
FEV1/FVC	64.4 (11.5)	78.2 (6.2)	<0.0001

The ‘cigarette smoke resistant’ population is defined in Methods.

FVC, forced vital capacity; FEV₁, forced expiratory volume in 1 s.