National Fire Incident Reporting System (NFIRS); home structure fires by smoke alarm performance 2000-2004 annual aAverages; 2000-2004 civilian death rate in home fires by smoke alarm status; 2000-2004 extent of flame damage by working smoke alarm power source; factors limiting smoke alarm effectiveness; sound and waking effectiveness; non-working smoke alarms and nuiscance alarms; nuisance activations by type of smoke alarm; type of smoke alarm and battery by operational status; smoke alarm activation to developing hazard