• Data reference period
• Place of residence (Portugal)
• Sex
• Age group

• LONG-STANDING HEALTH PROBLEM:  Health problem that lasts or is expected to last for six months or more.
• SEX:  Biological and physiological characteristics that define men and women.
• PRIVATE HOUSEHOLD:  A group of people living at the same dwelling, with either "de jure" or "de facto" family relationships,occupying the all or part of a dwelling; or a single person that fully or partly accupies a dwelling.
• CHRONIC DISEASE:  Disease that is predictably permanent and needs medical intervention to follow and control it.
• AGE GROUP:  The age interval in years to which a person belongs at the time of reference.
• REFERENCE PERIOD:  Period to which the information refers and which may be a specific day or a time interval (month, fiscal year, calendar year, among others).

[Resident population with 16 and more years old reporting any chronic disease or long-standing health problem/ Resident population with 16 and more years old]*100