Table 2

Characteristics of the study participants and the hamstring injuries

VariableNumberPer cent
Study participants, n=44
 Gender
  Male2863.6
  Female1636.4
 Mean age* in years (SD; range)23.8 (4.3; 18–39)NA
 Athletes who suffered 2 or more separate hamstring injuries†1431.8
  Mean number of injuries (median, range), n=142.5 (2; 2–4)NA
Injuries, n=65
 Total number of injuries in the sample of 44 athletes65
 Mean TRFT in days (SD; range)26.4 (28.1; 4–150)NA
 Location of the injury
  Grade 0a (MRI negative)2132.3
  Proximal812.3
  Central1827.7
  Distal1827.7
 Muscle injured
  No muscle injury2132.3
  Biceps (long head)2843.1
  Semitendinosus46.2
  Semimembranosus710.8
  Biceps (short head)11.5
  Multiple46.2
 Recurrences
  None5280
  Yes1320
   Yes after return to full training (re-injury)710.8
   Yes before return to full training (exacerbation)69.2
  • *Age at the time of first injury if more than one injury.

  • †That is, excluding re-injury.

  • NA, not applicable; TRFT, time to return to full training.