Proportion of students in each survey year in each of the smoking status levels
| Survey year | |||||
|
2011
% |
2013
% |
2014
% |
2017
% | Overall p value* | |
| Smoking status | |||||
| Non-susceptible non-smoker | 66 | 71 | 71 | 73 | <0.001 |
| Susceptible non-smoker | 8 | 8 | 8 | 10 | 0.157 |
| Experimental smokers | 16 | 13 | 12 | 10 | <0.001 |
| Current smoker (smoked past month) | 10 | 8 | 8 | 7 | 0.014 |
*Analyses conducted to test change in each smoking group relative to all other students, for example, non-susceptible non-smokers compared with susceptible non-smokers, experimenters and current smokers combined.