Schwarz 1993.

Methods	Non‐randomised controlled trial.
Participants	I: 5 contiguous census tracts [3004 households (51%) participated]. C: 4 bordering, contiguous census tracts (similar socio‐demographics, baseline injury rates).
Interventions	I: Free alarms installed; home safety inspection, education, modification; community education. C: No intervention.
Outcomes	Population injury surveillance 2 years before to 1 year after program; inspection of random sample of homes at 1‐year follow‐up: 1) Fire‐related injuries. 2) Final functioning alarms.
Notes	Unpublished data provided by investigators. Inspection response rate: I: 72%; C: 72%.
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	High risk	C ‐ Inadequate