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Volume 8, Number 7—July 2002


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 squarea p valueb
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.