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Volume 14, Number 5—May 2008


Efficacy of Aerial Spraying of Mosquito Adulticide in Reducing Incidence of West Nile Virus, California, 2005

Ryan M. Carney*1Comments to Author , Stan Husted*, Cynthia Jean*, Carol A. Glaser*, and Vicki Kramer†
Author affiliations: *California Department of Public Health, Richmond, California, USA; †California Department of Public Health, Sacramento, California, USA;

Main Article

Table 2

Statistical test results for West Nile virus cases, Sacramento County, California, 2005*

Area Goodness of fit†
Pretreatment Posttreatment Posttreatment vs. pretreatment
Treated, both 0.7508 <0.0001 <0.0001
Treated, northern 0.0650 0.0391 0.0053
Treated, southern 0.2983 <0.0001 0.0003
Treated plus buffer, both 0.6195 <0.0001 0.0005
Treated plus buffer, northern 0.1015 0.0314 0.0069
Treated plus buffer, southern 0.4568 <0.0001 0.0029
Buffer, both 0.5140 0.5744 0.3309
Buffer, northern 0.5592 0.5065 0.3745
Buffer, southern 0.5990 1.0000 0.7237

*Numbers of cases were combined for multiple areas; geographically corresponding buffer zones were added where noted. Numbers are 2-tailed p values. Statistically significant associations (p<0.05) are in boldface.
†Exact binomial goodness-of-fit test for observed proportion of cases in listed area(s) to cases in untreated area compared with the expected proportion based on population size estimates.
‡Fisher exact test of independence for 2 × 2 contingency tables containing numbers of pretreatment and posttreatment cases for listed area(s) and the untreated area.

Main Article

1Current affiliation: Yale University School of Medicine, New Haven, Connecticut, USA