The interpretation of a hazard ratio depends on its value:
HR = 1: Indicates no difference in hazard between the two groups. HR Indicates that the event rate is lower in the treatment group compared to the control group. HR > 1: Indicates that the event rate is higher in the treatment group compared to the control group.
For instance, if an HR of 0.8 is observed, it implies that the event of interest is 20% less likely to happen in the treatment group compared to the control group.