AP BIOLOGY

Detailed explanation-1: -Cancer incidence is the number of new cancer cases arising in a specified population over a given period of time (typically 1 year). It can be expressed as an absolute number of cases within the entire population per year or as a rate per 100 000 persons per year (see Crude Rate and Age-Standardized Rate below).

Detailed explanation-2: -For example, if a cancer incidence rate is 500 per 100, 000, it means that 500 new cases of cancer were diagnosed for every 100, 000 people.

Detailed explanation-3: -Estimated numbers of new cancer cases and deaths in 2022 (In 2022, there will be an estimated 1.9 million new cancer cases diagnosed and 609, 360 cancer deaths in the United States.)

Detailed explanation-4: -Incidence rate = (New cancers / Population) × 100, 000 The numerator of the incidence rate is the number of new cancers; the denominator is the size of the population. The number of new cancers may include multiple primary cancers occurring in one patient.

Detailed explanation-5: -An incidence rate describes how quickly disease occurs in a population. It is based on person-time, so it has some advantages over an incidence proportion. Because person-time is calculated for each subject, it can accommodate persons coming into and leaving the study.