Figures & data
Figure 1. Combinations of ground floor risk (λ1), above-ground floor risk (λ), and number of floors (n) where an elevator-based AED (above diagonal) or lobby-based AED (below diagonal) has shorter average response distance. For example, white dot: In 10-floor building (n = 10 on y-axis) with six times the OHCA risk on the ground vs. above-ground floor (λ1/λ = 6 on x-axis), an elevator-based AED is optimal.
![Figure 1. Combinations of ground floor risk (λ1), above-ground floor risk (λ), and number of floors (n) where an elevator-based AED (above diagonal) or lobby-based AED (below diagonal) has shorter average response distance. For example, white dot: In 10-floor building (n = 10 on y-axis) with six times the OHCA risk on the ground vs. above-ground floor (λ1/λ = 6 on x-axis), an elevator-based AED is optimal.](/cms/asset/0a11bcd1-1997-4e70-8dd6-acf484b62719/ipec_a_1247202_f0001_oc.gif)