Rapid responses are electronic letters to the editor. They enable our users to debate issues raised in articles published on thebmj.com. Although a selection of rapid responses will be included online and in print as readers' letters, their first appearance online means that they are published articles. If you need the url (web address) of an individual response, perhaps for citation purposes, simply click on the response headline and copy the url from the browser window. Letters are indexed in PubMed.
I really enjoyed this article. I am a great fan of nested case-control studies, and I praise every effort to make them as popular as they
deserve to be.
But why list this topic, clearly limited to epidemiological study design,
under the heading "statistical"?
I think this may engender confusion, promoting a view that statistics and
epidemiology are equivalent and interchangeable terms, and they certainly