Association of anti-<i>Alphavirus</i> IgG status with environmental and socio-economic factors.

Results of Poisson regression models adjusted for household clustering using robust variance estimates. N = number of observations; % pos. = percent anti-Alphavirus IgG positive in stratum; PR = Prevalence ratio; 95% conf.int = 95% confidence interval; SES rank = rank (from 0 for lowest to 10 for highest) according to socio-economic score. 1: results of separate models for each of the below covariates. 2: multivariable model including only age, elevation and slope of terrain as covariates.