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Volume 8, Number 6—June 2002

Research

Drought-Induced Amplification of Saint Louis encephalitis virus, Florida

Jeffrey Shaman*Comments to Author , Jonathan F. Day†, and Marc Stieglitz*
Author affiliations: *Columbia University, New York, New York, USA; †University of Florida, Vero Beach, Florida, USA;

Main Article

Table 1

Best fit results of univariate logistic regression analysis, Floridaa

Univariate Best Fits
Site Time lagged WTD Intercept Slope Whole model fit 
p-value Intercept Slope
1 16 66.70 44.22 0.015 0.016 0.0001
2 17 22.99 14.63 0.0093 0.015 0.0001
3 18 28.72 18.82 0.0050 0.0069 0.0001
4 16 74.10 49.01 0.016 0.017 0.0001
5 25 20.35 13.22 0.0004 0.0010 0.0001
All five sites 19 18.55 12.49 0.0001 0.0001 0.0001

aWTD, water table depth; the probability of SLEV transmission incidence is represented as a function of single time lags of weekly averaged modeled WTD. Whole model goodness-of-fit was assessed by log-likelihood ratio and the pseudo r-squared (uncertainty) coefficient. Individual parameter estimates were made by Wald’s chi-square test.

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