Table 1

Criteria used to determine the quality of evidence found

GradeQuality of evidence
A1Good systematic review, randomised controlled trial or other appropriate study design
A2Convincing non-experimental evidence (see definition in text)
B1Inconclusive evidence. A good quality study where the results could not be assumed to apply to the patient in the community paediatric setting
B2Inconclusive evidence. Poor study design or inadequate study power
CEvidence of ineffectiveness
DNo evidence found