Table 2.

Minimum effect sizes.

Key workers per huba,b	Intraclass correlationc	Minimum detectable effect size
6	0.25	0.68
6	0.5	0.56
8	0.25	0.59
8	0.5	0.49

^aEffect size is the expected difference between the 2 conditions (intervention-control) divided by the SD (ie, the square root of the total variance).

^bDetectable with 80% power for the proposed stepped-wedge design with 6 hubs, 3 periods, and 4 assessment time points.

^cIntraclass correlation: between individual variance divided by the sum of the between and within individual variances.