Table 1. Characteristics of the studies and subjects analyzed.

		OZALC-NAG	SAGE	ARIC
# Subjects		4038	2014	5198
% Men/%Women		49%/51%	44%/56%	56%/44%
Age, mean ± S.D.		45.16±10.43	37.97±9.09	54.30±5.7
Cigarettes per day
	0 to 10	1159	1001	1047
	11 to 20	876	518	2155
	21 to 30	958	223	941
	30 or more	1045	272	1052

^*CPD: Cigarettes per day.