Table III.

Cluster detection analysis results for meningitis data in Nottingham and Derbyshire counties, U.K., using the multinomial model. (See Figure 2.)

	Radius (m)	# Obs	RR in each category	LLR	p-value
Cluster 1	4948	56	(0.21, 0.82, 0.00, 1.07, 3.00)	18.10	0.001
Cluster 2	1745	18	(4.94, 0.23, 0.55, 0.62, 0.00)	14.44	0.033
Cluster 3	9546	37	(0.51, 1.83, 0.00, 1.51, 0.00)	14.10	0.041

^#Obs is number of total observations. RR is relative risk, computed as the ratio of the proportions of the number of cases in each category out of total number of cases inside the cluster versus outside. LLR is log-likelihood ratio.