Table 2 The calculation processes of PFE, MA, PAH, and the proportion of PFE attributable to MA versus PAH

Survivals under canopy

22

10

5

Survivals in open spaces

19

7

3

PFE

(22–19)/19 = 0.158

(10–7)/7 = 0.429

(5–3)/3 = 0.667

MA

0.158

0.158

0.158

PAH

0

0.429–0.158 = 0.271

0.667–0.158 = 0.509

MA proportion

(0.158/0.158) × 100% = 100%

(0.158/0.429) × 100% = 36.8%

(0.158/0.667) × 100% =23.7%

PAH proportion

(0/0.158) × 100% = 0%

(0.271/0.429) × 100% = 63.2%

(0.509/0.667) × 100% = 76.3%