Notes: The dependent variable is a dummy variable that equals 1 if the woman gave birth in that year, and 0 otherwise. |${prePneumonia}\ast {post1937}$| is the average state-level pneumonia mortality rate between 1930 and 1936, interacted with a dummy variable for the years 1937 and later. These are marginal effects from logistic regressions with standard errors (in parentheses) clustered at the woman’s birth state level and the table shows marginal effects at the means of all covariates in the estimating sample. In panel B, column (1) removes state-year varying controls, column (2) adds allows the state-year controls to have flexible coefficients by year, column (3) replaces the census region-year fixed effects with state linear trends, and column (4) replaces them with census division*year fixed effects. *denotes p-value < 0.1, ^**denotes p-value < 0.05, and ^***denotes p-value < 0.01.