Table 4

Quality assessment

External validityInternal validityTotal
AuthorSubjects representative?Determinants accurate?Statistical test appropriate?Losses to follow-up taken into account?Adjustment for confounding?High quality
Gibbs et al9Unable to determine*YesYesYesNo3
Koulouris et al17YesYesYesYesNo4
Malliaropoulos et al10YesYesYesYesNo4
Sherry and Best19NoUnable to determineYesNoNo1
Verrall et al18YesYesYesYesNo4
  • * Study does not report the source population from where the patients were selected.

  • Determinants measured were the rehabilitation programme and functional tests; it was unable to determine whether this was performed accurately.