Table 1 Baseline characteristics of cases and matched controls, NLST-ACRIN participants
|  | Cases N = 166 | Controls N = 286 |
|---|---|---|
Mean age | 63.0 | 62.6 |
Sex (female, %) | 39.8 | 38.5 |
Race (white, %) | 98.8 | 98.6 |
Years of Education (%) | ||
  < 8 | 1.8 | 1.1 |
 9–11 | 4.8 | 5.4 |
 12 | 21.8 | 23.7 |
 13–16 | 31.5 | 33.4 |
  ≥ 16 | 40.0 | 36.3 |
 Smoking status (current %) | 51.8 | 53.0 |
 Mean cigarettes per day | 27.1 | 26.7 |
 Mean pack-years of smoking | 56.7 | 55.4 |
 Menthol (%) | 16.3 | 21.3 |
TTFC (%) | ||
  ≤ 5 min | 38.0 | 31.1 |
 6–29 min | 36.1 | 41.0 |
 30–60 min | 15.1 | 12.4 |
  > 60 min | 10.8 | 15.6 |