title: Multi-centre versus single-centre trials in migraine.
abstract: Migraine trials often have to be performed at many centres, which creates a number of methodological problems. The present paper discusses single-centre versus multi-centre designs and also comments on the design of multiple-independent trials (MIT). From a methodological standpoint, the single-centre design should virtually always be preferred. When it is impossible to recruit enough patients in a single centre within reasonable time, a multi-centre design has to be used. The major advantage of multi-centre trials, apart from recruitment, is that they may yield a more representative basis for conclusions regarding the whole population. Multiple-independent trials give an opportunity to summarize information from different sources. It has not the same methodological strength as the single- or multi-centre trial, but could be valuable, especially for evaluation of side effects.
authors: Medical Department, AB Hässle, Mölndal, Sweden.
authors: C
authors: C
authors: Hedman
authors: A R
authors: AR
authors: Andersen
authors: J
authors: J
authors: Olesen
mesh_terms: D002986:Clinical Trials as Topic / Q000379:methods*; D006801:Humans; D008881:Migraine Disorders / Q000188:drug therapy*