Results
Table 2 reports the regression results for relative incidence (reported
cases over total population) obtained by OLS, Tobit without controlling
for other vaccines and Tobit controlling for other vaccines. For both
OLS and Tobit, the estimated coefficients represent the marginal effect
of the covariates on the outcome variable. Table 2 shows large and
strongly significant effects for per capita gross domestic product and
Human Freedom Index (positive) and for the summer season and BCG
vaccination (negative), even controlling for more vaccinations.
Table 3 contains estimated coefficients, with corresponding standard
errors and marginal effects, for CFR and MRs fractional regressions.
This table reveals large and strongly significant effects for health
expenditure and tropical position (positive) and for summer season and,
above all, BCG vaccination (negative), even controlling for more
vaccinations.
Table 4 contains the results of a robustness analysis on relative
incidence, where alternative measures for BCG have been used as
explanatory variables instead of the BCG dummy.
Table 5 contains the results of the same robustness analysis performed
on the CFRs and MRs. Both tables 4 and 5 confirm the results obtained
with the previous regressions.
All regressions feature the same set of explanatory variables, listed in
the data section, but tables only report statistically significant
coefficients, as well as their respective significance (10%, 5%, or
1%).