Most of the qualitative studies were carried out before or during the trials with few studies used to explain trial results. The findings of the qualitative studies seemed to be poorly integrated with those of the trials and often had major methodological shortcomings.IntroductionRandomised controlled trials are used widely for showing causal relations in health and social care because their study design is the only one that is able to control for unknown or unmeasured confounders. Randomised controlled trials are sometimes used to evaluate “complex” interventions that is, those “made up of various interconnecting parts”1 that act both “independently and inter dependently.”2 3 Qualitative approaches can contribute in several ways to the development and evaluation of both complex and other health interventions (box 1).
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