Relationship between GRADE and traffic alert action
| Effect | Grade | Traffic alert action | ||
| Favourable | Green | Strong and moderate quality evidence | Strong quality: We are very confident that the true effect lies close to that of the estimate of the effect. Moderate quality: We are moderately confident in the effect estimate: The true effect is likely to be close to the estimate of the effect, but there is a possibility that it is substantially different. | Do it—it is likely to be effective. |
| Favourable | Orange | Low and very low quality evidence | Low quality: Our confidence in the effect estimate is limited: The true effect may be substantially different from the estimate of the effect. Very low quality: We have very little confidence in the effect estimate: The true effect is likely to be substantially different from the estimate of effect. | Uncertain, measure to determine if progress is made. |
| Unfavourable | Orange | Low and very low quality evidence | ||
| Unfavourable | Red | Strong and moderate quality evidence | Strong quality: We are very confident that the true effect lies close to that of the estimate of the effect. Moderate quality: We are moderately confident in the effect estimate: The true effect is likely to be close to the estimate of the effect, but there is a possibility that it is substantially different. | Don’t do it |