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. 2011 Nov 18;120(2):235–240. doi: 10.1289/ehp.1103970

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.