Table 1: Descriptions of the studies used in the meta-analyses.

IDStudyConditionGenderAgeSubjectsStudy durationExposure (hr)InjuriesNotes

1Aoki et al. [6]BothMaleYouth332 players12 months106,783484Ages 12–17 years. Injury location and type reported for training only.

2Bjørneboe et al. [7] BothMaleAdult14 clubs4 seasons261,5411067Professional teams in the Norwegian Tippeligaen.

3Ekstrand et al. [8]BothBothAdult767 playersFollowed teams for 4–38 months246,4751492European elite players. Included “slight” injuries that required players to miss <1 day (~2% of total injuries). Since these could not be extracted, they were included in the present study.

4Ekstrand et al. [9]BothMaleAdult492 playersFollowed teams for 4–32 months82,874449European professional players. Compared two cohorts of players. The cohort of players that trained and played exclusively on grass were omitted from the current study.

5Fuller et al. [10]MatchBothAdult116 teams
126 teams
1st season
2nd season
79,2531794US College players. Utilized the NCAA Injury Surveillance System.

6Fuller et al. [11]TrainingBothAdult116 teams
126 teams
1st season
2nd season
545,8421592US College players. Utilized the NCAA Injury Surveillance System.

7Soligard et al. [12]MatchBothYouth>68,000 players4 occasions of a single tournament62,5972454Norway Cup youth tournament. Matches played over six consecutive days. Ages 13–19 years. Data for male and female players were pooled.

8Steffen et al. [13]BothFemaleYouth2020 players8 months113,023405Under-17 age group.