Difference between revisions of "Hazard ratio"
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| − | '''Hazard ratio''' ("HR") is a quantity often used in medical studies to show | + | '''Hazard ratio''' ("HR") is a quantity often used in medical studies to show a decrease in risk of mortality or harm from using the studied course of treatment. A hazard ratio of 1 signifies no change, while a hazard ratio of 0.5 signifies a 50% reduction in harm. |
| − | In other words, the hazard ratio is the risk of | + | In other words, the hazard ratio is the risk of a hazard relative to a control group risk of 1. |
The hazard ratio is defined formally in two different ways:<ref>https://www.sciencedirect.com/topics/medicine-and-dentistry/hazard-ratio#:~:text=The%20hazard%20ratio%20is%20the,interval%20of%20time%20(21).</ref> | The hazard ratio is defined formally in two different ways:<ref>https://www.sciencedirect.com/topics/medicine-and-dentistry/hazard-ratio#:~:text=The%20hazard%20ratio%20is%20the,interval%20of%20time%20(21).</ref> | ||
Revision as of 16:30, July 5, 2020
Hazard ratio ("HR") is a quantity often used in medical studies to show a decrease in risk of mortality or harm from using the studied course of treatment. A hazard ratio of 1 signifies no change, while a hazard ratio of 0.5 signifies a 50% reduction in harm.
In other words, the hazard ratio is the risk of a hazard relative to a control group risk of 1.
The hazard ratio is defined formally in two different ways:[1]
- The hazard ratio is the ratio of (chance of an event occurring in the treated group)/(chance of an event occurring in the control group).
- The hazard ratio is the ratio of (risk of outcome in one group)/(risk of outcome in the control group), occurring in a certain interval of time.