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The first world record in the decathlon was recognized by the International Association of Athletics Federations in 1922.
As of 23 June 2012, 36 men's world records have been ratified by the IAAF in the event.
The first world record in the women's decathlon was recognized by the IAAF in 2004. As of 21 June 2009, two world records have been ratified by the IAAF in the event.
References
Decathlon world record progression Wikipedia(Text) CC BY-SA