I conducted four wave repeated cross-sectional survey, I wondering how to analysis the data to reach my research aims 1）to describe the trends of the prevalence of mental disorders; 2)the association among different disorders.
Hello
I think you mean the following:
period prevelance = point prevelance * duration of the study
the correct formula is = incidence * duration
please look for the 1st forumla if it can be applied or not.
association : by correlation acc to normality test
pearson if normal distribution variables
spearman if abnormal distribution variables
the other measure of association is : regression ; acc to outcomes we can know the type of regression test.
You should calculate the point or period prevalence of each condition in each survey.To estimate trend you should inspect the data and fit a linear or other regression model using the time as independent variable. Do this for each condition separately. To look at associations you could bo pairwise correlations of condition prevalences across the four time points.
eg
survey. 1. 2. 3. 4
prev depression.%. 10. 12. 14. 17
prev anxiety%. 20. 20. 28. 10
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