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Table 1 Baseline characteristics of the study participants

From: Heat-not-burn tobacco, electronic cigarettes, and combustible cigarette use among Japanese adolescents: a nationwide population survey 2017

 MaleFemaleTotal
n = 34,582n = 29,570n = 64,152
n%n%n%
School grade
 Junior high school (12–15 y/o)
  Grade 7374010.8364412.3738411.5
  Grade 8368710.7364212.3732911.4
  Grade 9370210.7371312.6741511.6
 High school (15–18 y/o)
  Grade 10796323.0623821.114,20122.1
  Grade 11790322.9630921.314,21222.2
  Grade 12747021.6593420.113,40420.9
  Unknown1170.3900.32070.3
 Municipality size groups
  Large cities555116.1596820.211,51918.0
  Cities with populations ≥300,00010,20329.5728824.617,49127.3
  Cities with populations ≥100,00011,04932.0933931.620,38831.8
  Cities with populations < 100,000599517.3516817.511,16317.4
  Smaller towns and villages17845.218076.135915.6
 Having breakfast
  Every day28,07081.225,19285.253,26283.0
  Sometimes30798.926008.856798.9
  Seldom21696.313214.534905.4
  Unknown12643.74571.517212.7
 Participating in club activities
  Active20,10658.116,13654.636,24256.5
  Passive466713.5423214.3889913.9
  Not engaging847724.5864629.217,12326.7
  Unknown13323.95561.918882.9