1. This does not include pupils who completed the survey in local authorities that participated in the Realigning Children's Services. These areas were excluded from the mode effect study as all pupils completed the survey online.
2. Beebe et al. (1998). An Evaluation of computer-assisted self-interviews in a school setting: Public Opinion Quarterly Volume 63: 23-632.
3. Brener et al. (2004). The association of survey setting and mode with self-reported health risk behaviours among high school students; Survey Methods Newsletter, National Centre for Social Research, Vol 22: Spring 2004.
4. Halfours et al. (2000). A comparison of paper versus computer-assisted self-interview for school alcohol, tobacco and other drug surveys.
5. Ipsos MORI (n.d.) In-School Online Research: The Hows, Whys, Whens and When Nots of Using Online Interviewing in Schools. [Unpublished paper].
6. The Feasibility Study and online pilot study are available at: http://www.gov.scot/Resource/0047/00477361.pdf
7. The SALSUS 2015 Technical Report can be found at: http://www.gov.scot/Topics/Research/by-topic/health-community-care/social-research/SALSUS
8. The SALSUS Technical Report can be found at: http://www.gov.scot/Topics/Research/by-topic/health-community-care/social-research/SALSUS
9. Six local authorities were excluded from the sample profile analysis. Three were part of the Realigning Children's Services ( RCS) boost and all pupils in those local authorities completed the survey online. Three others had boosted their sample. Therefore, these six local authorities were disproportionately sampled.
10. Six local authorities were excluded from analysis. Three were part of the Realigning Children's Services boost and were completed solely online and three had boosted their sample. They were, therefore, disproportionately sampled.
11. For more information on the questionnaire and on particular measures, see the SALSUS 2015 Technical Report
12. One of the advantages of the online mode is that pupils cannot leave a question blank, give an unintelligible response or give more than one answer when they shouldn't.
13. For more details please see http://www.gov.scot/Topics/Statistics/SIMD
14. For more details please see http://www.gov.scot/Topics/Statistics/About/Methodology/UrbanRuralClassification
15. The SALSUS 2015 Technical Report can be found at: http://www.gov.scot/Topics/Research/by-topic/health-community-care/social-research/SALSUS
16. For various reasons, a more detailed analysis of the differences between modes in relation to missing answers and those who specifically stated 'none' or 'don't know' or similar would be very complicated and would be unlikely to yield particularly informative results.