A prospective study of injuries sustained during a National Rugby League season
Players were categorised into three playing groups: outside backs (fullback, wing and centre); adjustables (five-eighth or stand-off, half-back and hooker; loose forward); and hit-up forwards (second-row and front-row or props) (King et al., 2011). Injury incidence was measured in units of injuries per 1000 player hours. Injuries that occurred during an NRL or NYC match were included in the numerator and only players participating in grade matches in each week were
included in the denominator. The duration of each match was 80 minutes. This was calculated separately for NRL and NYC injuries.