Figure 2From: Observed intra-cluster correlation coefficients in a cluster survey sample of patient encounters in general practice in AustraliaIntra-cluster correlation (ICC) and 95% confidence interval for association between morbidity outcomes with health care card status as predictor in two BEACH samples, April 1999–March 2000 (N = 1,047 GPs) and April 2002–March 2003 (N = 1,008 GPs)Back to article page