Johnston 2000.

Methods	Non randomised controlled trial. Two groups assigned by coin toss. Unblinded outcome assessment.
Participants	418 families of children aged 4‐5 yrs enrolled in 9 government funded preschool enrichment centers for high‐risk children.
Interventions	I: Written safety information at home visit; alarms or batteries if needed, other safety devices. C: Written safety information at home visit.
Outcomes	Home inspection 3 months after visit: 1) Final functioning alarms. 2) Functioning alarms acquired.
Notes	Loss to follow‐up: I: 17.5%; C: 6.9%.
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	High risk	C ‐ Inadequate