The remaining columns show the robustness of the coefficient to alternative specifications.
Column 2 removes controls for current and lagged provincial GDP.
Column 3 contracts the analysis to a one-year window (2000–2002) and shows that the impact of the 30 Baht program remains quite stable. Column 4 expands the analysis to a four-year window (1997–2005) and column 5 adds province-specific linear trends. With province-specific linear trends in this expanded timeline, the coefficient increases slightly to −0.0082. This suggests our estimates are not driven by underlying heterogeneous geographical trends in infant mortality.