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...
Autor principal: | |
---|---|
Formato: | Texto |
Lenguaje: | English |
Publicado: |
BioMed Central
2004
|
Materias: | |
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 |