Hi dear list,
I would like some help from you. I may be misinterpreting some concepts.
Looking closer to the table of levels of evidence in
http://www.cebm.net/levels_of_evidence.asp, I noticed that ecological
studies are rated better than systematic reviews (with homogeneity) of
It may be ignorance of me, but what happened to the ecological fallacy?
Aren't the etiology/therapy studies concerned with individual inferences?
Aren't case-control studies more likely to establish temporal relationships?
Finally, where should I put good cross-sectional studies? In some fields,
they are the only evidence available.
Roger Keller Celeste
Doutorando Epidemiologia (PhD student)
Instituto de Medicina Social - UERJ
Rua São Francisco Xavier, 524 7o ANDAR
Rio de Janeiro - Brasil
Novo Yahoo! Messenger com voz: Instale agora e faça ligações de graça.