Cause of fire | No of fires | No of injuries | Injuries per 100 fires | No of fires with known SA status | % Fires with injuries, SA+ | % Fires with injuries, SA− | Odds ratio (95% CI)* | Injuries per 100 fires, SA+ | Injuries per 100 fires, SA− | Rate ratio (95% CI)† |
---|---|---|---|---|---|---|---|---|---|---|
Based on analysis of 13676 residential fires in Dallas, Texas, 1991–98. | ||||||||||
SA+, functional smoke alarm was present; SA−, functional smoke alarm was absent. | ||||||||||
*Odds ratios and 95% confidence intervals, for proportion of injury associated fires and the presence of a functional smoke alarm. | ||||||||||
†Rate ratios and 95% confidence intervals for number of injuries per 100 fires and the presence of a functional smoke alarm. | ||||||||||
‡p<0.01, by Kruskal-Wallis one way analysis of variance, for fireplay v arson or all other causes. | ||||||||||
Fireplay | 732 | 49 | 6.7‡ | 661 | 3.8% | 4.0% | 1.0 | 6.4 | 7.1 | 0.9 |
(0.3 to 2.6) | (0.4 to 1.9) | |||||||||
Arson | 3325 | 57 | 1.7 | 2512 | 2.5% | 1.8% | 1.4 | 2.5 | 2.1 | 1.2 |
(0.5 to 3.5) | (0.4 to 2.9) | |||||||||
All other | 9619 | 295 | 3.1 | 8595 | 1.5% | 2.7% | 0.6 | 2.1 | 3.3 | 0.6 |
(0.4 to 0.8) | (0.4 to 0.9) |