We begin with an analysis of the vital statistics records. Although our utilization data was at the individual level, the vital statistics records are only made available to us to the province-by-year level. To relate the infant mortality rate to the potential impact of the 30 Baht program, we use the HWS data to construct a variable FracMW S p equal to the fraction of a province enrolled in the MWS program in 2001. Figure 2 plots the distribution of FracMW S p MWS , showing substantial variation with a standard deviation of 0.11, which reflects the unequal distribution of income
across provinces.