Since 2002, statistics on the population structure by age and sex have been based on the data of the Central Population Register, although other administrative data sources are also used for quality assurance purposes within the framework of the Register-based Census and the Register-based Labour Market Statistics. Those persons are counted who are continuously registered with a main residence in Austria for more than 90 days around the reference date. Prior to 2002, population figures were collected within the framework of censuses. For the inter-censal period annual estimates were calculated for the population.
For data protection reasons, the frequency of the gender specifications “diverse”, “inter”, “open”, “no entry” or “unknown” is shown in a separate table on detailed gender only for Austria. In all other tables, these expressions are assigned to either female or male gender on the basis of an imputation rule.