Koontz 2004.

Methods	RCT. Mulitcentre: 22 schools in the USA.
Participants	8 ‐ 12 years. 28 randomized, 24 analysed.
Interventions	Intervention: educational material ‐ package with basic facts, 1 hour with teacher, 1 hour with peers. Control: routine services.
Outcomes	General knowledge questionnaire: caregiver (teacher and parent) and patient.
Notes	No pre‐values given, only post.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Insufficient information to permit judgement of ‘low risk’ or ‘high risk’.
Allocation concealment (selection bias)	Unclear risk	Insufficient information to permit judgement of ‘low risk’ or ‘high risk’.
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Insufficient information to permit judgement of ‘low risk’ or ‘high risk’.
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Insufficient information to permit judgement of ‘low risk’ or ‘high risk’
Incomplete outcome data (attrition bias) All outcomes	Low risk	24 / 28 (85.7%) participants analysed.
Selective reporting (reporting bias)	Low risk	Objective outlined in methods is reported in results.
Other bias	Unclear risk	No other bias anticipated, but insufficient information to permit judgement of ‘low risk’ or ‘high risk’.