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

• 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.
• REFERENCE PERIOD:  The length of time for which data are collected, e.g. a specific day, month or year.
• EDUCATIONAL LEVEL:  Level of the education and training system that is structured according to pre-school education and study cycles of educational levels such as: 1st cycle, 2nd cycle, 3rd cycle of basic education; secondary education, post-secondary non-tertiary education; pre-bologna bachelor's degree, bachelor's degree, master's degree and doctorate in tertiary education.
• TERTIARY EDUCATION:  Level of education that succeeds to upper secondary education, characterized by high complexity and specialized learning, oriented to the transition into the labor market.

(Resident population aged between 30 and 34 years old with higher education/ Resident population aged between 30 and 34 years old)*100