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Volume 8, Number 7—July 2002

Research

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 4

Population-adjusted Moran’s I (Ipop) analysis for spatial clustering of reported human brucellosis cases, California, 1973–1992

Years No. of cases z-score p value Within %a Among %a
Total population
1973–1977 106 7.79 <0.001 75.4 24.6
1978–1982 97 9.04 <0.001 62.1 37.9
1983–1987 98 4.94 <0.001 56.5 43.5
1988–1992 115 4.22 <0.001 93.1 6.9
1973–1992 416 18.67 <0.001 58.6 41.4
Hispanic population
1973–1977 60 6.84 <0.001 77.6 22.4
1978–1982 73 11.66 <0.001 61.2 38.8
1983–1987 75 1.19 0.23 78.5 21.5
1988–1992 97 3.87 <0.001 107.9b -7.9b
1973–1992 305 15.18 <0.001 70.8 29.2
Non-Hispanic population
1973–1977 46 1.52 0.13 80.7 19.3
1978–1982 24 0.15 0.88 95.0 5.0
1983–1987 23 1.47 0.14 91.0 9.0
1988–1992 18 0.49 0.62 82.9 17.1
1973–1992 111 1.41 0.16 92.3 7.7

aPercentage of estimated spatial clustering attributed to cases in the same counties and in adjacent counties.
bAll identified clustering attributed to cases in the same counties. Negative value in % demonstrates dispersion of cases in adjacent counties.

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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