Table 1.

Replacement of staff and the hamstring injury (HI) burden for team seasons with replacements compared with team seasons without replacements

Replacement of staff	Frequency of replacements	HI burden for team seasons without replacements (mean, 95% CI)	HI burden for team seasons with replacements (mean, 95% CI)	HI burden change when replacements compared without replacements	HI burden increase when team season replacement compared with without replacement (95% CI)
Total number of replacements during the 42 team seasons	49	24 (15 to 34)	32 (23 to 40)	+33%	8 (−6 to 21)
New head coach at the start of the season	10/42=24%	27 (20 to 31)	35 (24 to 46)	+30%	8 (−7 to 23)
Change of head coach during the season	10/42=24%	29 (20 to 37)	29 (12 to 45)	±0	0 (−16 to 14)
New head coach before or during the season	20/42=48%	27 (19 to 35)	32 (22 to 42)	+19%	5 (−8 to 18)
New head fitness/performance coach at the start of the season	10/42=24%	27 (19 to 34)	38 (28 to 47)	+41%	11 (−4 to 26)
Change of head fitness/performance coach during the season	7/42=17%	27 (20 to 33)	40 (20 to 60)	+48%	3 (−3 to 30)
New head fitness/performance coach before or during the season	15/42=36%	24 (17 to 31)	39 (28 to 50)	+63%	15 (3 to 28)
New head team doctor before or during the season	7/42=17%	26 (20 to 31)	47 (23 to 70)	+81%	21 (5 to 37)
New head physiotherapist before or during the season	7/42=17%	29 (22 to 35)	32 (10 to 55)	+10%	3 (-13 to 21)

HI burden is expressed as the number of days lost per 1000 hours of exposure.