The odd years have a statewide inclusion of more schools and the Even years has a smaller,select group of school districts producing dramatic but consistent fluctuations in the year to year data. Even years produce higher numbers, sometimes 100% higher than Odd years on identical questions. (See Exhibit I) http://www.ZeroAttempts.org/charts/healthyteen-wellness-or-composite-2009-2018.html or https://bit.ly/2Jj3XMA
While not perfect, I believe that there is a way to show a year-to-year trend. The specific questions I use in five categories don't change year-to-year,
1. Create an odd year chart (Exhibit II) http://www.ZeroAttempts.org/charts/healthyteen-or-composite-2009-2017-odd-year.html or https://bit.ly/2z673Pn showing the percent change from the previous odd year (two years prior). The red shows when the number is greater that the previous two-year survey period.
2. Create an even year chart (Exhibit III) http://www.ZeroAttempts.org/charts/wellness-or-composite-2010-2018-even-year.html or https://bit.ly/2OQwzTb showing the percent change from the previous even year (two years prior). The red indicates when the number is greater that the previous two-year survey.
3. Combine the percentage changes into one chart (Exhibit IV) http://www.ZeroAttempts.org//charts/Oregon-Pride-Surveys-or-composite-2009-2018.html or https://bit.ly/2P2GAMF to find the trend. This is particularly evident in Suicidally. Regardless of the year and the methodology, the red shows a continuing increase in suicidality for Oregon's 6th, 8th and 11th graders, a disturbing trend.
I hope you find this useful. If you're interested in keeping up on the information, abstracts, reports, stories and trainings on the issue of suicide prevention, check out Suicide-Watch, a free monthly email developed by the folks at ZeroAttempts.org. The email goes out on the first of every month. Click on http://bit.ly/2FqdEt0 any time from the current, updated report