Table 4.

Mean week of occurrence of hamstring injury and other injury type, 2013–2016 NFL regular season games.

Injury Type	N	Mean Week of Injury (NFL Midpoint: 8.5 weeks)	95% Confidence Interval	Median Week of Injury
HSI	78	8.05	[7.06, 9.04]	7.5
Other	1316	8.84	[8.58, 9.10]	9
t-statistic	1.41
P-Value (two-tailed)	0.159

NFL - National Football League. HSI - Hamstring Injury. Other refers to all injury types other than HSI.

Note: The NFL season was 17 weeks long at the time the data in this study was accrued. The NFL season is now 18 weeks as of 2021.