Table 1.
Criteria for judging the quality of individual trials.
| High | >75% of the criteria have been fulfilled [≧10/12]. Where they have not been fulfilled the conclusions of the study or review are thought very unlikely to alter. |
| Moderate | 50–75% of the criteria have been fulfilled [6–9/12]. Those criteria that have not been fulfilled or not adequately described are thought unlikely to alter the conclusions. |
| Low | Less than 50% of the checklist criteria were fulfilled [<6/12]. The conclusions of the study are thought likely or very likely to alter. |