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Journal article

Design and analysis of studies evaluating smoking cessation interventions where effects vary between practices or practitioners.

Abstract:

BACKGROUND: Patients grouped together in practices may share characteristics that cause them to have similar responses to an intervention. Sampling from such groups means that the power of a trial is less than when subjects are selected from the population at random. Knowledge of likely variation in outcome at the practice level is necessary to calculate the extent to which sample size would need to be inflated to maintain statistical power in the face of 'cluster effects'. OBJECTIVES: To pla...

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Publication status:
Published

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Publisher copy:
10.1093/fampra/13.4.402

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Institution:
University of Oxford
Department:
Oxford, MSD, Primary Care Health Sciences
Role:
Author
Journal:
Family practice
Volume:
13
Issue:
4
Pages:
402-407
Publication date:
1996-08-05
DOI:
EISSN:
1460-2229
ISSN:
0263-2136
URN:
uuid:1c28bdc5-9a13-4ca8-93ee-faa1cba4d180
Source identifiers:
430961
Local pid:
pubs:430961

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