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Table 1 Annual smoking frequency of students and percentage of new starters.

From: The incidence of smoking and risk factors for smoking initiation in medical faculty students: cohort study

  Prevalence Incidence*
Years n Smokers % (%95 CI) n New smokers % (%95 CI)
1st (register) 119 26 21.8 (15.3–30.1) - - -
2nd 119 35 29.9 (21.9–38.2) 93 12 12.9 (7.5–21.2)
3rd 119 38 31.9 (24.2–40.8) 81 6 7.4 (3.5–15.2)
4th 119 40 33.6 (24.2–40.8) 75 7 9.3 (4.6–18.1)
5th 112 29 25.9 (18.7–34.7) 68 2 2.9 (1.0–10.1)
6th 115 31 27.0 (19.7–35–7) 66 3 4.5 (1.6–12.5)
  1. *: For incidence calculations, only the new smokers within a particular year were taken into account; e.g. a group of students who smoked in the first year (21.8%) was not included in the calculations for the second year (29.9%).