Galvão (Andrade substudy).

Methods	RCT
Participants	School children
Interventions	BZD (n = 64) 7.5 mg/kg/day (8 weeks) Placebo (n = 65)
Outcomes	PCR recorded
Notes	Substudy of Andrade 2004, different outcomes Brazil 2003
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk
Allocation concealment (selection bias)	Low risk
Blinding of participants and personnel (performance bias) All outcomes	Low risk
Blinding of outcome assessment (detection bias) All outcomes	Low risk
Incomplete outcome data (attrition bias) All outcomes	High risk