volume 317, issue 7167, P1185-1190 1998
DOI: 10.1136/bmj.317.7167.1185
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Abstract: AbstractObjective To summarise comparisons of randomised clinical trials and non-randomised clinical trials, trials with adequately concealed random allocation versus inadequately concealed random allocation, and high quality trials versus low quality trials where the effect of randomisation could not be separated from the effects of other methodological manoeuvres. Design Systematic review. Selection criteria Cohorts or meta-analyses of clinical trials that included an empirical assessment of the relation be…

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