I'm using PROC FREQ to calculate associations between potential confounders, like age, and retinopathy. When I use PROC FREQ on a variable that has more than 2 groups, it won't show me prevalence ratio or 95% CI like it does with a two-level variable such as sex. For example, I want to use PROC FREQ to find the association between the age ordinal variable (age 30-60=1, age 61-70=2, >70=3) and retinopathy (0=no, 1=yes)
I did PROC FREQ age*retinopathy/no col nopercent all; run;
It gives me the chi-square but no CI or relative risk. How do I fix this?
Hello,
I would adopt a modelling approach, with PROC GENMOD for example.
See here (I haven't read the paper ! , just Googled it in order to try to give you an example) :
Proper Estimation of Relative Risk Using PROC GENMOD in Population Studies
Kechen Zhao, University of Southern California, Los Angeles, California
https://www.lexjansen.com/wuss/2013/81_Paper.pdf
Good luck,
Koen
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