| Methods |
Cluster randomised controlled trial.
Allocation method & blinding of outcome assessment not specified. |
| Participants |
Areas, counties or census tracts in 5 US states (4455 households with resident <5 or >64, without any working smoke alarms, located in high‐risk area [based on high prevalence of fire deaths, non functioning alarms, low income, or rental units]). |
| Interventions |
I1: Installation of smoke alarm(s) by study staff, fire safety education.
I2: Voucher for free smoke alarm(s), fire safety education. |
| Outcomes |
Home visit & inspection 6‐12 months after visit:
1) Self‐reported fires.
2) Final functioning alarms. |
| Notes |
Loss to follow‐up: I1: 28%; I2: 31%.
Fire rates not reported by investigator. |
| Risk of bias |
| Bias |
Authors' judgement |
Support for judgement |
| Allocation concealment? |
Unclear risk |
B ‐ Unclear |
