In survival analysis, the hazard ratio (HR) is the ratio of the hazard rates corresponding to the conditions characterised by two distinct levels of a treatment variable of interest.

A hazard ratio (HR) is the probability of an event in a treatment group relative to the control group probability over a unit of time. This ratio is an effect size measure for time-to-event data.

Aug 18, 2025 · A hazard ratio is a statistical measure that compares how quickly events occur in one group versus another. It indicates the relative rate at which an event, such as disease …

Hazard rate is a measure of the risk of an event occurring at a specific time, while hazard ratio is a measure of the relative risk of an event occurring between two groups of people — such as a …

The hazard ratio (HR) is the ratio of the rate at which the exposed group experiences an outcome to the rate at which the unexposed group experiences an outcome, and it provides the …

Dec 21, 2025 · What Is a Hazard Ratio? A hazard ratio compares the hazard (i.e., the event rate) in the treatment group to the hazard in the control group at any point in time.

Jun 25, 2025 · The hazard ratio is an expression of the hazard or chance of events occurring in the treatment arm as a ratio of the hazard of the events occurring in the control arm. The term …

You can think of the hazard as the slope of the survival curve. The hazard ratio is defined as the ratio of two hazard functions, λ 1 (t) and λ 2 (t), corresponding to two treatment groups.

Mar 13, 2025 · The hazard ratio is a comparative measure of the hazard—essentially, the risk of an event (such as death, relapse, or another endpoint) occurring at any given moment—in one …

Aug 29, 2025 · Hazard ratios (HRs) are vital statistical measures widely used in medical research, clinical trials, epidemiology, and other fields involving time-to-event data. They provide an …