and 10 that the Tellus survey estimates have either used
drugs/ volatile substances and/or been drunk at least
twice in the last 4 weeks or have used drugs/volatile
substances and been drunk once.
y = Tellus estimate of the total number of young people in
years 6, 8 and 10 responding to these questions in the
local population, based on school census data.
Challenges of using Tellus for national indicators
Continuity disruptions – changes to the survey (often for good reasons) that undermine indicator comparisons over time - e.g. changes to questions, question order, timing
Sample and weighting changes – positive activities and, particularly, substance misuse findings are sensitive to the balance of response from years 6, 8 and 10 so weighting needs to compensate for this, but be consistent
Analysis changes – e.g. what population is included in the denominator (e.g. treatment of Not Answered and Prefer Not To Say responses)
Response – needs a decent response rate across all LAs to be disaggregated and it has taken time to build that up