[2] The reason Portland was selected for 2016 and Birmingham for 2018 is that the IAAF wanted more time between events in the UK with London hosting the 2012 Summer Olympics as well as the 2017 World Championships in Athletics along with Cardiff hosting the 2016 IAAF World Half Marathon Championships.

[3] Portland would become the beginning of a similar sequence for the US, with the 2021 World Championships in Eugene, Oregon and the 2028 Summer Olympics in Los Angeles.

[6] The qualification period for all events runs from 1 January 2017 to 19 February 2018 (midnight Monaco time), except for the Combined Events where the qualification period runs from 1 January 2017 to 31 December 2017 and the five best athletes from the 2018 Indoor Lists (as at 12 February 2018).

This championship was notable for the large number of disqualifications, primarily lane violations (IAAF rule 163.3(a)).

Accusations were raised about the heavy handedness of the officiating and inconsistencies relative to similar acts committed by star British athletes at the 2017 Outdoor World Championships held in London just 5 and a half months earlier.