Note - standardization
Standardization was done using race pace for individual racers, years, and events. Course distances vary year to year. For standardization purposes, course distances were determined to be as listed in the accompanying table.
While the length of the new classic course used for 2017 was reported to be 55k, the new freestyle course has been variably reported to be either 50k or 51k since its construction. Standardized results are currently based on a 55k classic event and a 51k freestyle event in the expectation that these distances, or something close to them, will be the actual distances used for future events.