| A target layer | B criterion layer: main factor | C index layer: sub factors |
| A Risk factors assessment of a cruise ship epidemic | B1 biological factors | C1 source of infection |
| C2 transmission route | ||
| C3 susceptible population | ||
| B2 attitude factors | C4 cognitive component | |
| C5 emotional components | ||
| C6 behavioral components | ||
| B3 natural factors | C7 geological factors | |
| C8 meteorological factors | ||
| C9 ecological environment | ||
| B4 social factors | C10 system, policy and law | |
| C11 economic development level | ||
| C12 transportation system | ||
| C13 facilities and service capacity | ||
| C14 prevention and control measures | ||
| C15 health institutions and control measures |