* This is particularly relevant to professional football where injury rates are some three times higher than those reported in other occupations. In one study players were absent for the equivalent of “13% of the playing season” due to injuries. (Drawer, S. & Fuller, C.W., (2002), 'An economic framework for assessing the impact of injuries in professional football', Safety Science, Vol. 40, Issue 6, August, 537-556)
**A number of factors have been shown to influence the speed of golf greens and these have been summarised as being primarily grass type, rootzone composition, fertiliser input and cutting height. (Baker, S., (1997), 'Factors influencing the speed of putting surfaces', Greenkeeper International', July, 20-21)
