Table 6 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 simple exchangeable correlation structure

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

GEE

0.252

0.445

0.606

0.729

0.819

0.882

GEE-KC

0.220

0.388

0.536

0.657

0.752

0.824

GEE-MD

0.193

0.336

0.469

0.583

0.679

0.756

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

GEE

0.595

0.875

0.968

0.992

0.998

1.000

GEE-KC

0.526

0.816

0.938

0.981

0.995

0.999

GEE-MD

0.459

0.747

0.895

0.960

0.985

0.995