Table 1.

Inclusion and exclusion criteria used in the selection process.

Inclusion criteria	Exclusion criteria
1. Studies providing data about the prevalence of comorbidities in patients diagnosed with breast, colorectal, lung, melanoma, or prostate cancer, including previously diagnosed chronic conditions	Studies not providing data about the prevalence of comorbidities in patients diagnosed with breast, colorectal, lung, melanoma, or prostate cancer
2. Routinely collected prevalence data, derived from registries or health insurance claims databases	Incidental data collection or not routinely collected data (e.g., chart- or patient-based prevalence data measured for the purpose of one study)
3. Population studies are representative for a broad oncologic population. Selection based on age or insurance type was permitted.	Studies restricted by type of treatment, race, presence of a certain disease or complication, survival or response to a questionnaire
4. Observational studies	Case reports, randomized controlled trials, systematic reviews and meta-analyses
5. Publication between January 1, 1990 and June 25, 2020	Published before 1990
6. Published in English or Dutch	Published in other languages than English or Dutch
7. Originating from an OECD-country	Published outside of an OECD-country

Note: The 38 member countries are: Australia, Austria, Belgium, Canada, Chile, Colombia, Costa Rica, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Israel, Italy, Japan, Korea, Latvia, Lithuania, Luxembourg, Mexico, Netherlands, New Zealand, Norway, Poland, Portugal, Slovak Republic, Slovenia, Spain, Sweden, Switzerland, Turkey, United Kingdom, United States.