Comparison 3. Discounted or free smoke alarms versus control (subgroup analysis).

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Final smoke alarm ownership	10	2829	Odds Ratio (M‐H, Random, 95% CI)	1.21 [0.89, 1.64]
1.1 Discounted or free alarms	5	1897	Odds Ratio (M‐H, Random, 95% CI)	1.39 [0.69, 2.76]
1.2 Education only	5	932	Odds Ratio (M‐H, Random, 95% CI)	1.23 [0.92, 1.65]
2 Final functioning smoke alarms	10	3773	Odds Ratio (M‐H, Random, 95% CI)	1.33 [0.98, 1.80]
2.1 Discounted or free alarms	6	3451	Odds Ratio (M‐H, Random, 95% CI)	1.43 [0.93, 2.20]
2.2 Education only	4	322	Odds Ratio (M‐H, Random, 95% CI)	1.20 [0.71, 2.02]
3 Smoke alarms acquired	5	2023	Odds Ratio (M‐H, Fixed, 95% CI)	1.56 [0.95, 2.57]
3.1 Discounted or free alarms	3	1656	Odds Ratio (M‐H, Fixed, 95% CI)	1.48 [0.89, 2.46]
3.2 Education only	2	367	Odds Ratio (M‐H, Fixed, 95% CI)	4.11 [0.42, 39.94]
4 Functioning smoke alarms acquired	5	1693	Odds Ratio (M‐H, Random, 95% CI)	1.42 [0.99, 2.03]
4.1 Discounted or free alarms	4	1669	Odds Ratio (M‐H, Random, 95% CI)	1.42 [0.99, 2.03]
4.2 Education only	1	24	Odds Ratio (M‐H, Random, 95% CI)	0.0 [0.0, 0.0]