HIIC - Docs: HALYs

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HALYs

Health-adjusted life years (HALYs) are epidemiological measures of morbidity and mortality within a population. They are useful for comparable estimates of burden of disease, overall assessment of relative population-level impacts of specific illnesses, and in economic analyses.

Methodology

For a given year, HALYs are calculated by multiplying the average living population throughout the year by the prevailing disability rate. Interventions generate HALYs by reducing disability rate for a particular disease in the target population. The magnitude of HALYs generated by an intervention is determined by:

target_disease prevalence: that is, the abundance of the disease within the population.
target_disease severity: that is, the extent to which it reduces individual quality of life
Intervention effect size: that is, the magnitude of reduction in target_metric (incidence rate, mordbidity rate, or case-fatality rate) imposed by an intervention

Formal definition

Over a given interval of time,

t_{0} \rightarrow t_{1}

, total HALYs for an age-sex cohort is given by:

\text{HALYs\_gained} = \text{total\_HALYs}_{INT} - \text{total\_HALYs}_{BAU}

where,

\text{total\_HALYs} = \frac{population_{t_1} - population_{t_0}}{2} \cdot \frac{DR_{t_1} - DR_{t_0}}{2}

and

DR_{i}

denotes the population-level disability rate for the given target_disease, in year

i

Data sources Cost savings

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HALYs

Methodology