Table 3.

Sensitivity of the association between ozone exposure coefficient and ozone mortality coefficient to values for key parameters.

1-hr [O3]			8-hr [O3]			24-hr [O3]
Parameter	R2	p	R2	p	R2	p
x – default value		0.58		< 0.001		0.56		< 0.001		0.48		0.001
xmin – lower estimate		0.58		< 0.001		0.51		< 0.001		0.45		0.002
xmax – upper estimate		0.45		0.002		0.41		0.004		0.31		0.007
λopen – 1.5/hr (default value)		0.58		< 0.001		0.56		< 0.001		0.48		0.001
λopen – 0.5/hr (lower estimate)		0.61		< 0.001		0.56		< 0.001		0.49		0.001
λopen – 5.0/hr (upper estimate)		0.29		0.022		0.34		0.011		0.27		0.026
ksr – 3/hr (default value)		0.58		< 0.001		0.56		< 0.001		0.48		0.001
ksr – 0.8/hr (lower estimate)		0.57		< 0.001		0.58		< 0.001		0.51		< 0.001
ksr – 7.6/hr (upper estimate)		0.57		< 0.001		0.55		< 0.001		0.48		0.001
y – default value		0.58		< 0.001		0.56		< 0.001		0.48		0.001
y – upper estimate		0.48		0.001		0.48		0.001		0.46		0.002
tin/tout – default value		0.58		< 0.001		0.56		< 0.001		0.48		0.001
tin/tout – upper value		0.47		0.002		0.59		< 0.001		0.50		0.001
Abbreviations: x, fraction of year cooling occurs; λopen, difference in air change rate when windows are open versus when they are closed; ksr, rate constant for ozone removal by indoor surfaces; y, fraction of residences with central AC; tin/tout, ratio of time spent indoors to time spent outdoors and in vehicles.