Table 1.

Proportion of hamstring injury and other injury type that occurred on grass and turf fields, 2013–2016 NFL regular season games.

Injury Type	N	Grass Field (n = 18) (%)	Turf Field (n = 14) (%)
HSI	78	33	45
		(42.3%)	(57.7%)
Other	1316	639	677
		(48.6%)	(51.4%)
χ2 for Independence	1.15
P-Value	0.283

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