Table 3.

Results for pediatric appendicitis study

Model	RR	95% CI or CrI
GLM-Bin	0.76	0.51–1.11
GEE binomial	0.79	0.56–1.13
GEE binomial, KC-corrected		0.53–1.19
GEE Poisson	0.80	0.56–1.14
GEE Poisson, KC-corrected		0.53–1.21
GLMM binomial	0.76	0.51–1.11
GLMM binomial bootstrap		0.51–1.10
Bayesian binomial GLMM	0.73	0.49–1.07

Abbreviations: CrI Credible interval, GEE Generalized estimating equation, GLM-Bin Log-binomial regression model, GLMM Generalized linear mixed model, KC Kauermann and Carroll, RR Relative risk

The KC bias correction in the GEE models adjusts the robust SE for the small number of centers (estimate of RR does not change)