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Table 1 Summary of covariate categories

From: A semi-parametric approach to estimate risk functions associated with multi-dimensional exposure profiles: application to smoking and lung cancer

Covariate Category id Category description N. Subjects
Average intensity of smoking 0 Non-smoker 823
  1 0 < cigarettes per day ≤ 10 716
  2 10 < cigarettes per day ≤ 20 1540
  3 20 < cigarettes per day ≤ 30 1014
  4 30 < cigarettes per day 550
  NA Not available 15
Duration of smoking 0 Non-smoker 823
  1 0 < years ≤ 20 972
  2 20 < years ≤ 30 887
  3 30 < years ≤ 40 1073
  4 40 < years 903
Time since quit smoking 0 Non-smoker 823
  1 20 < years 870
  2 10 < years ≤ 20 583
  3 0 < years ≤ 10 996
  4 Current smoker 1386
Pack-years 0 Non-smoker 823
  1 0 < pack-years ≤ 15 1089
  2 15 < pack-years ≤ 30 1043
  3 30 < pack-years ≤ 45 888
  4 45 < pack-years 800
  NA Not available 15
  1. The categories used to apply profile regression to data from the ICARE case-control study.