Table 1

Quality assessment checklist.

Criteria used to assess study
  1. Clearly defined study objective

  2. Appropriate design for study question

  3. Inclusion and exclusion criteria clear and appropriate

  4. Representative sample (and comparison)

  5. Sample size calculation presented

  6. Appropriate selection of outcome

  7. Appropriate measurement of outcome

  8. Standardised collection of data

  9. Adequate length of follow up for research question

  10. Baseline participation >70% (all groups)

  11. Losses and drop outs <20%

  12. Adequate description of losses and completers

  13. Appropriate analysis of outcomes measured

  14. Numerical description of important outcomes given

  15. Adjusted and unadjusted calculations provided (with CI if appropriate)

  • CI = confidence interval