High	Very confident that the true effect lies close to that of the estimate of the effect
Moderate	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
Low	Confidence in the effect estimate is limited – the true effect may be substantially different from the estimate of the effect
Very Low	Very little confidence in the effect estimate – the true effect is likely to be substantially different from the estimate of effect