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Table 1 Numbers of participants and checkups

From: Long-term effectiveness of adolescent brief tobacco intervention: a follow-up study

   Control group (n = 1 238) Intervention group (n = 1 348) Average age
  Year n % of group n % of group y.
Dental checkup       
   First session 1992 1,238 100 1,348 100 13.1
   Second session 1993 1,029 83.1 1,149 85.2 14.2
   Third session 1994 726 58.6 845 62.7 15.2
   Fourth session 1994 247 20.0 305 22.6 15.6
Follow-up 2008 491 39.7 529 39.2 ~29