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Table 1 Sample characteristics.

From: Genetic analyses of smoking initiation, persistence, quantity, and age-at-onset of regular cigarette use in Brazilian families: the Baependi Heart Study

  Non-smokers Former smokers Current smokers Overall
  % n % n % n n
Sex male 34.5 349 58.2 239 53.7 146 734
  female 65.5 662 41.8 172 46.3 126 960
Age 18-24 20.0 202 5.6 23 9.2 25 250
  25-39 31.3 316 18.7 77 24.3 66 459
  40-54 22.6 229 44.1 181 41.2 112 522
  55+ 26.1 264 31.6 130 25.3 69 463
Cigarettes smoked per day 1-10 NA NA 51.3 211 51.8 141 352
  11-20 NA NA 30.7 126 34.2 93 219
  21-30 NA NA 4.9 20 5.1 14 34
  31+ NA NA 10.2 42 0.4 1 43
  no answer NA NA 2.9 12 8.5 23 35
  1. Age: age at the time of interview; NA: not available.