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Table 2 Estimated sample sizes and smoking prevalence and incidence by age and year group

From: Determining the impact of smoking point of sale legislation among youth (Display) study: a protocol for an evaluation of public health policy

Age group/Grade % pupils in each class1 N pupils per school Tot no pupils 4 schools Estimated response rates2 Prevalence regular smoking3 Incidence regular smoking Prevalence ever smoked Incidence ever smoked
     % N % N   % N  
School Surveys 2013-14
13/S2 100% 188 752 85% 640  
15/S4 100% 188 752 85% 640
Total all schools 376 1504 85% 1280
Total per school   376 85% 320
School Surveys 2015-17
12/S1 18.1% 217 866 85% 736 1.0% 7 1.0% 4% 26 4%
13/S2 18.3% 220 878 85% 747 4.8% 35 3.8% 23% 168 19%
14/S3 18.8% 225 902 85% 767 11.0% 84 6.3% 35% 268 13%
15/S4 18.8% 225 901 85% 766 16.5% 126 5.5% 44% 333 9%
16/S5 15.7% 189 754 85% 641 20.0% 128 3.5% 47% 298 3%
17/S6 10.2% 123 491 85% 417 24.0% 100 4.0% 47% 194 0%
Total all schools 1198 4793   4074   482    1287  
Per School   1198   1018   120    322  
  1. 1. Distribution of pupils over different age groups is based on most recent School statistics released by Scottish Government.
  2. 2. Response rates are based on HBSC survey experience.
  3. 3. Regular smoking defined as weekly smoking. Percentage 13 and 15-year old based on SALSUS, Percentages 12, 14, 16 and 17-year olds based on plotting, making use of HBSC smoking data for 11-year olds, SALSUS 13 and 15-year olds and 17-year olds’ data from the Scottish health survey (16-24-year olds: Male 24%; Female 29%) [1820].