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Table 2 Junior high (grades 7–9) and high school (grades 10–12) students’ age-adjusted smoking prevalence rates by gender

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

 Ever C useEver EC useEver HNB use
%95% CI%95% CI%95% CI
Grades 7–9
 Male3.13.0, 3.22.42.3, 2.51.31.3, 1.3
 Female2.1**2.0, 2.21.7**1.6, 1.80.9*0.9, 0.9
 Both2.62.5, 2.72.12.0, 2.21.11.0, 1.2
Grades 10–12
 Male6.96.6, 7.24.94.7, 5.12.92.8, 3.0
 Female3.3**3.2, 3.42.1**2.1, 2.11.4**1.4, 1.4
 Both5.14.8, 5.43.53.3, 3.72.22.0, 2.4
 Current C useCurrent EC useCurrent HNB use
%95% CI%95% CI%95% CI
Grades 7–9
 Male0.70.7, 0.70.80.8, 0.80.60.6, 0.6
 Female0.50.5, 0.50.5**0.5, 0.50.40.4, 0.4
 Both0.60.5, 0.70.70.6, 0.80.50.5, 0.5
Grades 10–12
 Male2.01.9, 2.11.51.4, 1.61.21.1, 1.3
 Female0.9**0.9, 0.90.5**0.5, 0.50.6**0.6, 0.6
 Both1.51.4, 1.61.00.9, 1.10.90.8, 1.0
 Daily C useDaily EC useDaily HNB use
%95% CI%95% CI%95% CI
Grades 7–9
 Male0.20.2, 0.20.10.1, 0.10.10.1, 0.1
 Female0.10.1, 0.10.10.1, 0.10.10.1, 0.1
 Both0.10.1, 0.10.10.1, 0.10.10.0, 0.2
Grades 10–12
 Male0.70.6, 0.80.10.1, 0.10.10.1, 0.1
 Female0.2**0.2, 0.20.10.1, 0.10.0**0.0, 0.0
 Both0.50.4, 0.60.10.1, 0.10.10.1, 0.1
  1. C combustible cigarette, EC electronic cigarette, HNB heat-not-burn tobacco, CI confidence interval
  2. Two proportion Z-tests were conducted to compare male and female. **P < 0.01, *P < 0.05