Odds of injury associated with exposure and reaction to warning systems among surveyed cases (N = 98) and controls (N = 200).

aEach warning system controlled for access to respective system, age, sex and race; frequency of annual siren exposure adjusted for age, sex, race, and past tornado exposure after hearing sirens; past tornado exposure after hearing sirens adjusted for age, sex, race, and the frequency of annual siren exposure; reaction to siren on April 27, 2011 adjusted for age, sex and race.
bReference category is answer “no” to respective item.
cMultiple positive responses allowed.
dCalculations restricted to individuals who were exposed to sirens that day (N = 49 cases and N = 131 controls).