Luby 2006 PAK.

Methods	Cluster‐RCT Allocation sequence: computer generated Allocation concealment: not described Blinding: open Length of follow‐up: 14 months (63 weeks) Cluster‐adjustment method: adjusted
Participants	Number: 577 households: hand washing promotion (195 households), hand washing promotion plus water treatment (187 households) and control arm (195 households). Inclusion criteria: same used in Luby 2003b PAK Exclusion criteria: same used in Luby 2003b PAK Age: children under 5 years
Interventions	Intervention (see Table 5 for detailed description): Follow‐up of earlier trial done in 2003 See Luby 2003b PAK
Outcomes	Longitudinal prevalence of diarrhoea Sustainability of hand washing behaviour
Notes	Location: Karachi, Pakistan Duration: 63 weeks
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Adequate.
Allocation concealment (selection bias)	Unclear risk	Not described.
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	None. Trial is a follow‐up on Luby 2003a PAK
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Not described.
Incomplete outcome data (attrition bias) All outcomes	Low risk	One household was not accounted for in the analysis.
Selective reporting (reporting bias)	Low risk	None observed.
Other bias	Low risk	None observed.