Environmental models for all influenza peaks, by latitudinal interval.

*p** p***pahigh latitudes are regions poleward of 25°N/S.bmiddle latitudes are regions between 12.5°N/S and 25°N/S.clow latitudes are regions equatorward of 12.5°N/S.The results of selected logistic regression models, based on Aikake Information Criterion (AIC) and the proportion of peaks accurately predicted by each model using a jackknife leave-one-out method. These values can be compared against the expected values and corresponding confidence intervals under the null distribution in the bottom row. The models are in descending order based on the proportion of peaks accurately predicted. Influenza peaks were lagged by 1-month with respect to each environmental variable with the exception of precipitation.