• Data reference period
• Place of residence (Portugal)
• Sex
• Level of education

• EDUCATIONAL QUALIFICATIONS:  The degrees, diplomas, certificates, professional titles and so forth that an individual has acquired by study.
• REFERENCE PERIOD:  The length of time for which data are collected, e.g. a specific day, month or year.
• RESIDENT POPULATION:  Set of persons who, regardless of being present or absent in a given housing unit at the moment of observation, have lived in the place of their usual residence for a continuous period of 12 months prior to the moment of observation, or have arrived to the place of their usual residence during the period of 12 months prior to the moment of observation, with the purpose of living there for a year, at least.
• COMPLETE COLONOSCOPY:  -

[Resident population with 50 and more years old who reported having made a colonoscopy in the 10 years preceding the interview/ Resident population with 50 and more years old]*100