Which analytic used in healthcare is calculated as a proportion of new cases compared to person-time units?

Cumulative incidence refers to the total number of new cases of a disease in a population over a specified time period divided by the total population at risk during that period. Unlike incidence rate, it does not incorporate the concept of person-time units, making it unsuitable for calculating rates that account for varying lengths of follow-up among individuals.

Prevalence measures the total number of existing cases of a disease in a population at a specific time, regardless of when the cases were diagnosed. It does not focus on new cases or time at risk, thus failing to reflect the dynamics of disease incidence and is not calculated using person-time units.

Morbidity rate generally refers to the incidence or prevalence of a disease within a certain population. However, it is often used in a broader sense and does not specifically calculate new cases against person-time units, making it less precise for measuring the frequency of new cases compared to the incidence rate.