The association of hospital-level neuraxial anesthesia use proportion with 30-day survival. (A) The log-transformed association is provided. For each value between 1 to 100%, we calculated the specific hazard ratio (HR) and 95% CI to make interpretation of the association between our log-transformed exposure with survival possible on the more familiar HR scale. The regression coefficient for the log-transformed proportion is not directly interpretable as a HR without accounting for the data transformation. The dotted line represents the null value for the HR (i.e., a value of 1). (B) The HR and 95% CI within each quintile of hospital-level NA use are provided. Where the HR and 95% CI exclude 1 (the null value), the difference is statistically significant.