Both incidence rates and mortality rates vary substantially between countries. Why?
Differences between countries in incidence rates, could be:
Actual differences due to underlying differences in susceptibility to a cancer or to differences in prevalence of risk factors
Artefactual differences due to differences in:
Difference between countries in mortality rates could be caused by:
- Underlying variations in actual incidence rates
- Differences in treatment (access to curative treatment may differ across countries)
- Differences in reporting
Discussion question (see figures)
What are possible reasons for the differences between incidence and mortality rates all cancers combined in
Different patterns between incidence and mortality maps, could be:
Actual differences due to better treatment or access to treatment in some countries
Artefactual differences due to:
- Over reported incidence
- Under reported incidence
- Mortality incorrectly reported?