Table 7 Predicted powers for three effect sizes in combination with different cluster sizes and the number of clusters = 8, prevalence rate = 50%, OTE = log(1.68) for a nested exchangeable correlation structure

\({\theta }_{3}={\text{log}}\left(1.5\right)\)

GEE

0.251

0.444

0.604

0.727

0.816

0.879

GEE-KC

0.220

0.387

0.534

0.654

0.749

0.821

GEE-MD

0.192

0.336

0.467

0.581

0.676

0.753

\({\theta }_{3}={\text{log}}\left(2\right)\)

GEE

0.595

0.874

0.967

0.992

0.998

1.000

GEE-KC

0.525

0.815

0.937

0.981

0.994

0.998

GEE-MD

0.459

0.746

0.894

0.959

0.985

0.995