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Methods. The Acha-National College Health Assessment Ii

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Methods
The ACHA-National College Health Assessment II (ACHA-NCHA II) is a national research survey organized by the American College Health Association (ACHA) to assist college health service providers, health educators, counselors, and administrators in collecting data about their students ' habits, behaviors, and perceptions on the most prevalent health topics.[1]
Population and Sample Selection
Forty one Canadian postsecondary institutions self-selected to participate in the spring 2016 ACHA National College Health Assessment. A random sample of students in each institution received email invitation to the survey.[2-4] All schools collected data via the ACHA-NCHA web survey.
Study Participants
A total of 43,780 surveys were completed …show more content…

3. Other Variables
We assess respondent’s history of alcohol and marijuana use within the last 30 days.
Inclusion Criteria
For this analysis, of all the survey results we included respondents who were 18 years of age or older and self-identified as being sexually active during the last 12 months.
Procedure
Permission for conducting the research and using the spring 2016 ACHA-NCHA dataset was granted by the School of Public Health at the University of Saskatchewan. The project reviewed and approved by the University of Saskatchewan Research Ethics Review Board (REB). A request to obtain Canadian data for the selected variables for this analysis was sent to the ACHA-NCHA. Information regarding the University of Saskatchewan survey was obtained through collaboration with the Student Health Services office within the university campus.
Statistical Analysis
Of the 43,780 completed surveys, a total of 29,308 (66.9 %) were included in this analysis based on the above criteria. Descriptive statistics and cross-tabulations were calculated to characterize demographic information and sexual and other risky behaviors. Those with missing values or “not applicable” responses were excluded from the relevant analyses.
In order to assess the degree to which STI was associated with multiple demographic, sexual and behavioural variables, Pearson’s correlation coefficients were calculated. Chi-square analyses were conducted during

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