Table 7.

The quality score and scientific level of evidence for articles investigating hamstring eccentric exercise as a preventative exercise to prevent injury in professional footballers

Study name	Study design	Participant details	Playing level	Main finding	Quality score (%)	Level of evidence
Arnason et al16	Non-randomised controlled trial	18 to 24 players per team: 24 to 31 teams	Icelandic Premier League and 1st Division Norwegian Premier League	Supports hamstring eccentric exercise to prevent injuries	54	2+
*Croisier et al13	Prospective cohort	462 players (n of teams not specified)	Brazilian, Belgian and French leagues (Specific level not specified)	Supports hamstring eccentric exercise	71	2+
Askling et al17	Randomised controlled trial	30 players from 2 teams	Swedish Premier League	Supports hamstring eccentric exercise	69	1+

*Article used in more than 1 section.