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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 2

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

Years Population County California areaa Chi square p valueb
1973–1977 Hispanic Los Angeles Southern California 74.94 <0.001
Orange Southern California 4.57 0.02
Stanislaus Central Valley 2.99 0.04
1978–1982 Hispanic San Luis Obispo Southern California 5.83 0.008
Santa Barbara Southern California 3.31 0.03
Fresno Central Valley 2.99 0.04
Kern Southern California 2.99 0.04
1983–1987 Non-Hispanic Sacramento Central Valley 2.99 0.04
Santa Cruz San Francisco Bay 2.99 0.04
1988–1992 Hispanic Alameda San Francisco Bay 15.42 <0.001
Ventura Southern California 11.95 <0.001
Non-Hispanic Los Angeles Southern California 4.57 0.02
San Bernardino Southern California 2.99 0.04

aSouthern California = Imperial, Kern, Los Angeles, Orange, Riverside, San Bernardino, San Diego, San Luis Obispo, Santa Barbara, and Ventura Counties; Central Valley = Colusa, Fresno, Glenn, Kings, Madera, Merced, Sacramento, San Joaquin, Solano, Stanislaus, Sutter, Tulare, and Yolo Counties; San Francisco Bay = Alameda, Contra Costa, Marin, San Francisco, San Mateo, Santa Clara, and Santa Cruz Counties.
bp-value based on one-sided chi-square test with 1 degree of freedom.

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.