Note that the number at risk should contain the number who were at risk at the beginning of the period, minus the censored observations. If your research aims to improve pregnancy rates then the events in the control group can be live births while 'number at risk' is actually the couples still trying to get to that stage who have not dropped from the study for other reasons. Risk might not make sense in some instances, e.g. ![]() You need to follow an exact order of columns in order for the tool to work as expected: Column 1: time (number of days, weeks, months, years, etc.), Column 2: events in treatment group, Column 3: number at risk in treatment group, Column 4: events in control group, Column 5: number at risk in the control group. Relative hazard or RH) between an exposed/treatment group and a control group.The tool only has one input field for your raw data and one to specify the confidence level for your confidence interval. Quick navigation.Using the hazard ratio calculatorThis hazard ratio calculator allows you to perform a post-hoc statistical evaluation of time to event data when the outcome of interest is the change in the average hazard ratio (abbr.
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