Emerging Infectious Disease ISSN: 1080-6059

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Time-Space Clustering of Human Brucellosis, California, 1973–1992 ¹

Geoffrey T. Fosgate*, Tim E. Carpenter*, Bruno B. Chomel*, James T. Case†, Emilio E. DeBess‡, and Kevin F. Reilly§

Author affiliations: *University of California, Davis, California, USA; †California Animal Health and Food Safety Laboratory, Davis, California, USA; ‡Department of Human Services, Portland, Oregon, USA; §California Department of Health Services, Sacramento, California, USA;

Main Article

Table 1

Ederer-Myers-Mantel (EMM) procedure for time-space clustering of reported human brucellosis cases, California, 1973–1992

Population	No. of cases	Chi square^a	p value^b
Hispanic	305	3.800	0.03
Non-Hispanic	111	6.078	0.007
Total	416	8.100	0.002

^aEMM test statistic follows an approximate chi-square distribution with 1 degree of freedom.
^bp-value based on a one-sided test (half of usual chi-square p-value).

Main Article

1 Preliminary results of this study were presented at the 9th Symposium of the International Society for Veterinary Epidemiology and Economics, August 6–11, 2000, Breckenridge, Colorado, USA.

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