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Table 1 Baseline characteristics of cases and matched controls, NLST-ACRIN participants

From: Nicotine dependence as an independent risk factor for atherosclerosis in the National Lung Screening Trial

  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