Table 1.

Clinical Characteristics of AA, EA, and Pooled Samples

Characteristic	African-American	European-American	Pooled
No. of nuclear families	402	200	602
Avg. members/family	3.14±0.75	3.17±0.69	3.15±0.73
No. of subjects	1,366	671	2,037
Female (%)	66.1	69.5	67.2
Age (years)	39.4±14.4	40.5±15.5	39.7±14.8
No. of smokers	1,053	515	1,568
Age of smoking onset	17.3±4.7	15.5±4.4	16.7±4.7
Years smoked	20.4±12.5	23.2±13.5	21.3±12.9
Smoking quantity/day	19.4±13.3	19.5±13.4	19.5±13.3
HSI	3.7±1.4	3.9±1.4	3.8±1.4
FTND score	6.26±2.15	6.33±2.22	6.29±2.17

Notes: HSI = Heaviness of Smoking Index; FTND = Fagerstrom Test for ND.