Temporal and spatial dynamics of Cryptosporidium parvum infection on dairy farms in the New York City Watershed: a cluster analysis based on crude and Bayesian risk estimates

Table 3 The most likely temporal, spatial, and space-time clusters identified by the SaTScan statistics using the Poisson probability model, based on crude prevalence estimates

Analysis type	Observed^a	Expected^b	RR^c	P-value	Population^d	Shape
Purely Temporal	57	38	2	0.002	169
Purely Spatial
Spring	no significant cluster
Summer	no significant cluster
Winter	14	4	5.87	0.003	29	elliptical
Space-Time	37	20	2.3	0.031	83	circular
	40	17	3	0.004	78	elliptical

ISSN: 1476-072X