Appendix A

Characteristics of the excluded studies with previously described hamstring injury

First author, year of publicationStudy populationNo. of subjects*Definition of previous injuryAge (years) (mean±SD)% MaleNo. of recurrencesRisk factors for recurrence
Engebretsen et al22Norwegian elite soccer players with recorded hamstring injury61Questionnaire: number, severity, nature and number of months since the most recent hamstring injury24.8±0.6100%10 (16.4%)Previous hamstring injury, OR=2.19 (1.19–4.03), p=0.01
Gabbe et al23Elite Australian Rules football athletes with hamstring injury resulting in at least one missed match31Questionnaire: hamstring injury sustained during the previous 12 months21.8 (17.6–37.1)100%10 (32.3%)Previous hamstring injury, OR=4.30 (1.66–11.15), p=0.003 Age, OR=4.04 (1.24–13.11), p=0.020
Petersen et al24Danish elite soccer players with an hamstring injury32Recalled hamstring injury in the last year before this study17–35100%8 (25%)
Verrall et al4Elite Australian Rules football athletes who sustained an acute Grade 1–3 hamstring32Injury occurred within the last two playing seasons and resulted in at least one missed match20.5±3.4 21.6±3.4100%13 (40.6%)Previous hamstring injury, OR=4.9 (1.6–15.1), p=0.006
Woods et al1English elite soccer players with a reported hamstring injury by their Club medical staff749Sustained during training or competition that prevented the injured player from participating for more than 48 h17–35100%89 (11.9%)
Warren et al25Elite Australian Rules football Athletes with a hamstring injury resulting in at least one missed match59Clinically diagnosed by medical personnel and missed at least one missed match24 (17–33)100%9 (15%)Previous hamstring injury past 12 months, AOR=16.9 (1.5–261.1), p=0.025
  • * Number of subjects are those athletes who sustained a hamstring injury.

  • Age range of subjects included in the study.

  • Age≥25 years.

  • AOR, adjusted odds ratio.