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st: How to do trend test of OR?
One question need help:
I'm analyzing prevalence comparison from two cross-sectional survey.
After stratified by an ordinal variable, I calculate the prevalence
difference and Odds Ratio at each level, here is the result:
level prevalence1 prevalence2 difference OR
1 13.0 14.8 1.8 1.16
2 19.7 23.6 3.9 1.51
3 27.5 38.0 10.5 2.30
The ordinal variable has 5 levels, listing in first column.
prevalence1 was from survey 1, prevalence2 from survey 2.
I want to know how to test whether there is a linear trend for the
difference or Odds ratios in the table using stata?
Thanks in advance.
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