IDREF199 false 2026-08-14T05:56:15.1177279+01:00 UNData Core Concept Scheme Core UNData cross-domain concepts Dataset Name Dataset Source Dataset Description UNData Last Update UNData Next Update Indicator Metadata Frequency The time interval at which observations occur over a given time period. Unit Unit Multiplier Age Sex Location Reference Area Time Period Reference date - or date range - the observed value refers to (usually different from the dates of data production or dissemination). For MDG data exchange it is usually expressed as a four-digit year (e.g.: 1995) so, if the observation refers to a period of time (range), details about such period should be specified in the attribute TIME_DETAIL Time Span Specifies time range for series describing multiple year intervals. Observation Value Footnotes Additional information on specific aspects of each observation, such as how the observation was computed/estimated or details that could affect the comparability of this data point with others in a time series.