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We examine the current quality of reporting of the sample size calculation in randomized controlled trials (RCTs) published in PubMed and to examine the variation in reporting across study design, study characteristics, and journal impact factor.
Our review suggests that the reporting of the sample size determination in the research protocol often lacks essential information.
Firstly, the reporting of the sample size determination in the study publication is less detailed than in the research protocol.
Main outcome measures Completeness of reporting of the sample size determination, including the justification of design assumptions, and disagreement between reported and recalculated sample size.
Reporting of the sample size calculation has greatly increased in the past decades, from 4% of reports describing a calculation in 1980 to 83% of reports in 2002.
Given that the quality of reporting of the sample is very similar to the quality of all 47 reviews we believe that our sampling approach is representative and enables us to generalize the observed results.
Similar(50)
Reported fluorescence of the sample Reported fluorescence of a sample that is above background fluorescence and corresponds to a positive concentration.
Physical measurements are also reported of the samples' coarse and fine surface finishes, compliance, sliding friction and thermal contact properties.
It can be seen that the minimum amount of environmental disclosures in the annual report of the sampled companies is 0 with a maximum of 115 words.
A comprehensive report of the sampling strategy is found in Marsland and Murrells [ 39].
No experience with own illness or illness of others reported 13.7% of the sample.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com