- 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...
Expand abstract - Publication status:
- Published
- Publisher copy:
- 10.1093/fampra/13.4.402
-
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- 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
- Copyright date:
- 1996
Journal article
Design and analysis of studies evaluating smoking cessation interventions where effects vary between practices or practitioners.
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