Studies that evaluated the effectiveness of diarrhea intervention used longitudinal prevalence and incidence.

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Antonio Cabrera De Leon

Clinical trials are longitudinal studies. They measure the incidence in the groups under study and then calculated the relative risk (RR). For example:

Incidence 1 = number of new cases in group 1 / total number of patients in group 1.

Incidence 2 = number of new cases in group 2 / total in group 2 patients.

RR = incidence 1 / incidence 2

Cesar P Carcamo

Antonio is right, but in some cases, like in cluster randomized interventions, you could compare prevalences at followup, adjusted for baseline prevalences (see Lancet. 2012 Mar 24;379(9821):1120-8)