st: Multilevel analysis and clustering in case control study

["Claassens, MM, Dr <mcla@sun.ac.za>" <mcla@sun.ac.za>]

Dear Statalist -

I am writing up an article on a case control study.  Methods:  primary healthcare facilities (clusters) were randomly selected.  All cases from the selected facilities were included.  The case:control ratio was 1:4.  Cases/controls were not matched apart from coming from the same facility.

I am interested in looking at individual level determinants (age/sex etc) as well as facility level determinants (rural/urban facility etc.).

My question is:  what is the best way to analyse this?

I have used -xtlogit- with -re- up till now, but am not sure whether the cases/controls are actually 'matched' on facility...  Should I be using -clogit- instead?  But then, how do include both levels?

Thanks very much for the help!

Mareli Claassens
PhD student



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