F2 and pulmonary embolism: LOS: Length of Stay, P-value: significance defined as <0.05, Coefficient: The estimated effect size of the variable on the outcome, 95% Confidence Interval: A range that estimates where the true value of the coefficient lies with 95% confidence, Ref: Reference group (used as the baseline comparison group in statistical analysis), NI: Not Included (indicates that the variable was not included in the statistical analysis), $: Income range in U.S. dollars, PE: Pulmonary Embolism, PGM: Prothrombin Gene Mutation.