Mueller 2008.

Methods	RCT
Participants	Households with low to mid‐level income
Interventions	I1= Ionization smoke alarm installed + instructions given in maintenance + fire extinguisher provided I2 = Photoelectric smoke alarm installed + instructions given in maintenance + fire extinguisher provided
Outcomes	Outcomes measured at 9 and 15 months: At 9 months: Functional smoke alarm. I1=264/332, I2=322/340; OR 0.22 (0.12 to 0.38) At 15 months: Functional smoke alarm. I1=239/311, I2=287/314; OR 0.31 (0.19 to 0.51)
Notes	Blinding ‐ n Outcomes 80% ‐ y Balance ‐ n/a
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment (selection bias)	Unclear risk	Unclear