Main effects for the model of the probability of extinction for each of the 4 infections identified using the ‘step’ function in R; and then eliminating variables not significant at the 0.05 level; standard errors shown in brackets; stars indicate significance with ° for p-values <0.1, * for p<0.05

Residual deviances are 1140.4, 1318.3, 541.0, and 208.1 respectively in the order of the columns of the table; and degrees of freedom are 3513, 4004, 1044 and 203. Significant interactions were retained in the models, including an interaction between N and HDI for measles [0.85(0.25)***] and mumps [–1.626(0.779)*]; and an interaction between HDI and M for rubella [–1.39(0.62)*]. “OR” indicates the odds ratios corresponding to each covariate.