Illustrative examples - WHO pre-eclampsia
trial
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An interim analysis is going to be suggested to the DSMC to be conducted after the completion of the first 4500 subjects. If the difference between the proportions of occurrence of pre-eclampsia in the two groups is significant in a two-sided test at the level alpha=0.01 then the trial will be stopped prematurely. The adjustment for repeated testing at the final analysis will then be negligible, leaving a significance level of practically alpha=0.05. (WHO Multicentre Randomized Trial of Calcium Supplementation for the Prevention of Pre-eclamsia - go to protocol) |
Illustrative examples - Magpie trial
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Whilst recruitment to the Magpie Trial is ongoing, interim
results will be supplied, in strict confidence, to the chair of the
data monitoring committee as frequently as requested. Meetings of the
committee will be arranged periodically as considered appropriate by
the chair but at least annually. In the light of the interim data, and
of any other evidence or advice they wish to seek, the data monitoring
committee will inform the chair of the steering committee if, in their
view: (i) there is proof beyond reasonable doubt that - either for all
women or for any particular category of women |
This checklist was developed by Dave Sackett, who prepared it for the forthcoming 3rd edition of Clinical Epidemiology; A Basic Science for Answering Questions about Health Care, to be published by Lippincott, Williams & Wilkins in 2004.
This document provides guidance for the design, conduct, analysis,
and evaluation of clinical trials of an intervention in the context of
its overall clinical development.
(To come)