Cox Proportional Hazards Ratio & 95% CI Calculator

Estimate the hazard ratio and its 95% confidence interval from a Cox proportional hazards model given event counts, person-time, or regression coefficients. Interprets HR in the context of covariate adjustment.

 
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Physical Constants Reference
ConstantSymbolValue
Speed of lightc2.99792458×10⁸
Planck's constanth6.62607015×10⁻³‴
Boltzmann constant1.380649×10⁻²³
Avogadro's numberNₐ6.02214076×10²³
Gravitational constantG6.6743×10⁻¹¹
Gas constantR8.31446
Elementary chargee1.602176634×10⁻¹⁹
Electron massmₑ9.1093837015×10⁻³¹
Proton massmₚ1.67262192369×10⁻²⁷
Fine-structure constantα7.2973525693×10⁻³
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How It Works

Estimate the hazard ratio and its 95% confidence interval from a Cox proportional hazards model given event counts, person-time, or regression coefficients. Interprets HR in the context of covariate adjustment

Each component has a specific meaning:

  • Cox proportional hazards model given event counts — The cox proportional hazards model given event counts recorded for the patient or scenario being assessed.
  • Person-time — The person-time recorded for the patient or scenario being assessed.
  • Or regression coefficients — The or regression coefficients recorded for the patient or scenario being assessed.

Note: Interpret the cox hazard ratio ci result against the clinical thresholds and context described above.

How to Use

Enter the Cox proportional hazards model given event counts, person-time, or regression coefficients for the patient or scenario you are assessing. Estimate the hazard ratio and its 95% confidence interval from a Cox proportional hazards model given event counts, person-time, or regression coefficients. Interprets HR in the context of covariate adjustment. Use the cox hazard ratio ci result to inform your clinical assessment.

Frequently Asked Questions