Table 3 Description of the types of measures used for reporting incidence
Incidence measure (as reported)a | N (% out of 165) | |
|---|---|---|
Age-standardized incidence rate (ASR) | A weighted average of the age-specific incidence rate (weights are from a standard population) | 132 (80.0) |
Age-specific incidence rate (ASIR) | The number of new cases in a specific age group divided by the corresponding person-years of observation in that particular age group, multiplied by a constant | 50 (30.3) |
Crude incidence rate (CR) | The number of new cancer cases divided by the total number of person-years of observation, multiplied by a constant | 31 (18.8) |
Cumulative incidence rate | The total age-specific incidence rate for each year during a specific age span (commonly expressed as a percentage) | 3 (1.8) |
Cumulative risk | The probability of developing cancer within a specific age span (usually between 0–74), in the absence of competing causes of death (calculated by a formula using the cumulative rate) | 7 (4.2) |
Truncated ASR | The ASR calculation is restricted to a specific age range (usually 35–64) | 3 (1.8) |
Delay-adjusted rate | The incidence rate is corrected for the lag in case capture, which affects recent data years | 4 (2.4) |
Risk-adjusted rate | The numerator in the rate calculation is adjusted for secondary cancers of the same site, and the denominator is adjusted for prevalent cases | 1 (0.6) |
Incidence rate: | The number of new disease cases in a specific population divided by the population’s size at risk during a particular period | 18 (10.9) |
  • Derived from modelling |  | 4 |
  • Reported as the frequency of new cases |  | 2 |
  • Reported as the percentage of CRC cases among various groups |  | 2 |