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- W2103452254 abstract "The World Health Organization and collaborating institutions in four developing countries have conducted a multi-centre randomized controlled trial, in which clinics were allocated at random to two antenatal care (ANC) models. These were the standard 'Western' ANC model and a 'new' ANC model consisting of tests, clinical procedures and follow-up actions scientifically demonstrated to be effective in improving maternal and newborn outcomes. The two models were compared using the equivalence approach. This paper discusses the implications of the equivalence approach in the sample size calculation, analysis and interpretation of results of this cluster randomized trial. It reviews the ethical aspects regarding informed consent, concluding that the Zelen design has a place in cluster randomization trials. It describes the estimation of the intracluster correlation coefficient (ICC) in a stratified cluster randomized trial using two methods and reports estimates of the ICC obtained for many maternal, newborn and perinatal outcomes. Finally, it discusses analytical problems that arose: issues encountered using a composite index, heterogeneity of the intervention effect across sites, the choice of the method of analysis and the importance of efficacy analyses. The choice of the clustered Woolf estimator and the generalized estimating equations (GEE) as the methods of analysis applied is discussed." @default.
- W2103452254 created "2016-06-24" @default.
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- W2103452254 date "2001-01-01" @default.
- W2103452254 modified "2023-10-16" @default.
- W2103452254 title "Methodological considerations on the design and analysis of an equivalence stratified cluster randomization trial" @default.
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- W2103452254 doi "https://doi.org/10.1002/1097-0258(20010215)20:3<401::aid-sim801>3.0.co;2-1" @default.
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