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Cálculo del coeficiente de correlación intraclase y del efecto del diseño en estudios y ensayos aleatorizados por grupos, sobre el uso de inyecciones en Paquistán y países en vías de desarrollo
Author(s) -
Janjua Naveed Zafar,
Khan Mohammad Imran,
Clemens John D.
Publication year - 2006
Publication title -
tropical medicine and international health
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.056
H-Index - 114
eISSN - 1365-3156
pISSN - 1360-2276
DOI - 10.1111/j.1365-3156.2006.01736.x
Subject(s) - intraclass correlation , cluster (spacecraft) , medicine , randomized controlled trial , developing country , variance (accounting) , correlation , statistics , psychological intervention , cluster randomised controlled trial , correlation coefficient , demography , surgery , mathematics , psychometrics , computer science , nursing , clinical psychology , business , geometry , accounting , sociology , programming language , economics , economic growth
Summary Background To assess injection practices and to test interventions aimed at reducing unsafe injections in developing countries, cluster surveys and cluster randomized trials are needed. The design of cluster‐based studies requires estimates of intraclass correlation coefficients that have to be obtained from previous studies. This study presents such estimates. Methods Data were derived from a cross‐sectional study of injection use and health seeking in Pakistan that used 34 clusters to select 1150 study subjects aged ≥3 months. We analysed variance to separate its components. Results Most of intraclass correlation coefficients were in the range of 0.01–0.05. For proportion of injections received during last 3 months, mean number of injections received and health seeking during the past 3 months the intraclass correlation coefficients were 0.02, 0.04 and 0.02, respectively. Conclusion These estimates can be useful in designing cluster surveys and cluster randomized trials for injection safety in Pakistan and other developing countries.