Table 1. Clinical and demographic characteristics of African American subjects.

	Male	Female
N	181	218
Age	19.2 ± 0.7	19.3 ± 0.7
Smoking Status
Non-Smoker	111	181
Less than ½ Pack Years	42	30
≥ 1/2 and < 2 Pack Years	12	7
≥ 2 and < 5 Pack Years	1	0
≥ 5 Pack Years	15	0