Intracluster correlation coefficients from the 2005 WHO Global Survey on Maternal and Perinatal Health: implications for implementation research.

@article{Taljaard2008IntraclusterCC,
  title={Intracluster correlation coefficients from the 2005 WHO Global Survey on Maternal and Perinatal Health: implications for implementation research.},
  author={Monica Taljaard and Allan Donner and Jos{\'e} Villar and Daniel Wojdyla and Alejandro Velazco and Vicente Bataglia and An{\'i}bal Fa{\'u}ndes and Ana Langer and Alberto Narv{\'a}ez and Eliette Valladares and Guillermo Carroli and Nelly Zavaleta and Archana Shah and Liana Camp{\'o}donico and Mariana Romero and Sof{\'i}a Reynoso and Karla Sim{\^o}nia de P{\'a}dua and Daniel Giordano and Marius Kublickas and Arnaldo Acosta},
  journal={Paediatric and perinatal epidemiology},
  year={2008},
  volume={22 2},
  pages={117-25}
}
Cluster-based studies involving aggregate units such as hospitals or medical practices are increasingly being used in healthcare evaluation. An important characteristic of such studies is the presence of intracluster correlation, typically quantified by the intracluster correlation coefficient (ICC). Sample size calculations for cluster-based studies need to account for the ICC, or risk underestimating the sample size required to yield the desired levels of power and significance. In this… CONTINUE READING
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