Table 1

Summary of selected demographic variables by study groupa

VariableCases (n = 52)Controls (n = 89)
Age (years)68 (44, 79)b67 (45, 81)b
Gender (% male)9699
Ethnicity (%)
 Caucasian6769
 Hispanic2127
 African-American91
 Native-American22
Smoking status (% current)2832
Smoking, duration (yrs)50 (18, 66)b36 (3, 64)b,c
Smoking, pack-years66 (18, 177)b48 (1, 183)b,c
Smoking, time quit (yrs)3 (1, 34)b20 (1, 42)b,c
  • a Statistical comparisons are between cases and controls.

  • b Median (minimum and maximum).

  • c P < 0.005.