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2006 Survey Methodology

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The Oregon Healthy Teens Survey (OHT) is the one state-sponsored survey designed to monitor the health and well being of adolescents. An anonymous and voluntary research-based survey, the OHT is designed and administered through a collaborative group of Oregon state agencies including the Department of Human Services, the Department of Education, the Governor's Commission on Juvenile Justice, the Commission on Children and Families and the Oregon Progress Board. This year's surveys consisted of one version for 8th and one version for 11th graders, containing approximately 225 separate response items. The only difference between the two versions was the exclusion of two questions on the 8th grade survey relating to sexual identity.

Students Surveyed and Response Rates

This year's survey was conducted among over four in ten of all 8th and 11th graders statewide. Surveyed schools were selected through four processes: As part of a statewide random sample, as a Coordinated School Health (CSH) school, as part of the Oregon Research Institute (ORI) Prevention evaluation (there was some overlap between these three groups) or as a volunteer school. The surveys were conducted by a private contractor to DHS, who instructed classroom teachers in proctoring the survey. Surveys were returned from nearly 29,000 students, representing an overall response rate of 81.2% of those sampled. Of these, 3.0% were excluded because of extensive patterns of discrepant and/or dubious (extreme) answers, while 5.8% were excluded because their grade level could not be determined or because of missing gender information. This left 26,440 valid surveys (91.2% of the total received, with 15,291 from 8th grade and 10,676 from 11th grade in 32 counties. There was no data collected at all from Jefferson, Josephine, Lincoln and Wallowa counties, while Yamhill had no 8th grade data.

District and School Reports

Summary and detailed reports were sent to each participating school and district. These reports are available from the school district. Caution should be used when interpreting percentages based on a small number of respondents. Further, the schools were not selected to provide a reliable estimate for an individual district so caution should be used when combining school data within a district. No personally identifiable information is available because the survey was anonymous. To further protect confidentiality, reports were not broken down by gender if there were fewer than 10 males and 10 females in the school's valid sample. School-specific reports used simple unweighted counts and percents.

Weighting Adjustment

The surveys from schools that were part of the statewide random sample (8,577 8th graders, 7,967 11th graders) are weighted, based on district size information, to be representative of all 8th or 11th grade students within a particular county or the state. The published reports for counties and states include weighted percentages for accurate prevalence estimates, but often also include unweighted counts so readers know how many surveys make up each response. Because of the weighting, any percentage recalculation based on the unweighted counts will differ slightly from the published percentages. The published percentages accurately represent county and state prevalence with an overall statewide margin of error (at 95% confidence interval) at +/- 0.5% for the 8th grade and +/- 0.5% for the 11th grade. The exact margin of error for each question is smaller and varies, depending on the percentage estimated for that particular question. The margins of error for county estimates are slightly larger; depending on the numbers of surveys collected in the county, but are generally smaller than +/- 5%.

State and County Reports

OHT statewide and combined 2005/2006 county-level results are available on this website. The 2006 statewide estimates are based only on schools selected as part of the state sample. To increase sample size at the county level, the combined 2005/2006 county-level reporting includes data collected from all respondents including volunteer schools.

More Detailed Information

For more detailed information, you can view the long form report (pdf) of the 2005/2006 Oregon Healthy Teens methodology.