Before revision: For example, if a population initially contains 1,000 persons and 28 develop a condition since the disease first occurred until a certain point in time , the cumulative incidence proportion is 28 cases per 1,000 persons, i.e.
After revision: For example, if a population initially contains 1,000 persons and 28 develop a condition since the disease first occurred until two years later , the cumulative incidence proportion is 28 cases per 1,000 persons, i.e.