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Sample size and power estimation for studies with health related quality of life outcomes: a comparison of four methods using the SF-36
We describe and compare four different methods for estimating sample size and power, when the primary outcome of the study is a Health Related Quality of Life (HRQoL) measure. These methods are: 1. assuming a Normal distribution and comparing two means; 2. using a non-parametric method; 3. Whitehead...
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| Formato: | Texto |
| Lenguaje: | English |
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BioMed Central
2004
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| Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC421748/ https://www.ncbi.nlm.nih.gov/pubmed/15161494 http://dx.doi.org/10.1186/1477-7525-2-26 |