Open AccessWhen Intraclass Correlation Coefficients Go Awry: A Case Study From a School-Based Smoking Prevention Study in South Africa
Author(s) -
Keen Resnicow,
Nanhua Zhang,
Roger Vaughan,
Priscilla Reddy,
Shamagonam James,
David M. Murray
Publication year - 2010
Publication title -
american journal of public health
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.284
H-Index - 264
eISSN - 1541-0048
pISSN - 0090-0036
DOI - 10.2105/ajph.2009.160879
Subject(s) - intraclass correlation , demography , medicine , correlation , psychology , environmental health , clinical psychology , psychometrics , mathematics , sociology , geometry
We conducted a group randomized trial of 2 South African school-based smoking prevention programs and examined possible sources and implications of why our actual intraclass correlation coefficients (ICCs) were significantly higher than the ICC of 0.02 used to compute initial sample size requirements.