Table 3.

Standard power of the prospective space-time scan statistics – flexible and cylindrical – at different days of the outbreak

			Power on Day 31			Power on Day 32			Power on Day 33
Outbreak areas	No. of zip codes s*	excess risk	flex. K = 20	cylind. K = 20	cylind. 50% pop	flex. K = 20	cylind. K = 20	cylind. 50% pop	flex. K = 20	cylind. K = 20	cylind. 50% pop
Cluster A	1	high	0.764	0.860	0.862	0.988	0.996	0.996	0.999	0.999	0.999
Cluster A5	5	high	0.797	0.850	0.847	0.994	0.996	0.996	1.000	1.000	1.000
The Rockaways	5	high	0.769	0.855	0.840	0.992	0.997	0.997	1.000	1.000	1.000
Hudson River	20	high	0.656	0.597	0.632	0.964	0.933	0.949	0.998	0.994	0.995
Cluster A	1	med.	0.272	0.357	0.357	0.651	0.733	0.737	0.844	0.915	0.916
Cluster A5	5	med.	0.382	0.435	0.428	0.752	0.801	0.795	0.914	0.940	0.941
The Rockaways	5	med.	0.261	0.373	0.348	0.648	0.768	0.759	0.848	0.924	0.917
Hudson River	20	med.	0.290	0.257	0.297	0.631	0.582	0.610	0.845	0.782	0.803