Table 1.

Demographic characteristics

VariablesStudy subjects (n = 276)
Age, mean ± SD58.0 ± 9.9
Gender (%)
    Female52.9
    Male47.1
Race (%)
    Non-Hispanic White75
    Hispanic19
    Other6
Smoking history
    Current (%)46
    Pack years, mean ± SD41.0 ± 25.5
    Duration, mean ± SD32.7 ± 10.7
Cryopreservation duration (d, mean ± SD)368 ± 190
Seeding count (×106/culture, mean ± SD)1.7 ± 0.6
Mutagen sensitivity (number of breaks per cell, mean ± SD)0.28 ± 0.16