Table 2 Criteria for rating the methodical quality of studies

 Randomized

1

 Controlled

1

 Use of standardized diagnostic criteria

1

 All subjects accounted for/withdrawals noted

1

 Well-validated, reliable measures

2

 Questionable/unreliable outcome measures

0

 Statistical significance considered

1

 Adjustment for multiple comparisons

1

 Evidence of sufficient power

1

 Blind ratings

1

 Follow-up 6 months or beyond

1

 Good quality

> 7

 Poor quality

< 5