Hazard Ratio Calculator
Calculate hazard ratio (incidence rate ratio) from person-time data
Group 1 (Exposed/Treatment):
Group 2 (Unexposed/Control):
About Hazard Ratio
The hazard ratio compares event rates between two groups.
HR = 1: No difference in hazard
HR > 1: Higher hazard in group 1
HR < 1: Lower hazard in group 1
Note: This is an approximation. For Cox regression HR, more complex analysis is needed.