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Reducing the worldwide mortality ratio by 75 per cent between 1990 and 2015 is a key Millennium Development Goal. Randomized controlled trials (RCTs) are the accepted 'gold standard' to assess the effectiveness of interventions but they are not always appropriate for practical, ethical or economic reasons in developing countries. This study examines the use of cluster randomized trials and quasi-experimental (nonrandomized) study designs to evaluate complex interventions implemented to reduce maternal mortality.

Evaluating effectiveness of complex interventions aimed at reducing maternal mortality in developing countries