Table 2: The attribute set and attribute value set.

ClassAttribute setAttribute value set

Condition attributeAge ( ) <18, 18–35, >35
Gender ( ) Female, male
Education ( ) Senior high school or below (SHS), junior college or above (JC)
Temperament ( ) Choleric, sanguine, phlegmatic, and melancholic
Experience ( ) Never experience gas/training experience/knowledge (NE),
have gas experience/training experience/knowledge (HE)
Group relationship ( ) Kin, lover, friend, colleague, or classmate (FC)

Decision attributeGroup decision-making ( ) The minority is subordinate to the majority (MSM); choose the route approved by self (ABS); choose the route approved by the one familiar with the route (ABF); choose the route approved by the one doing things reasonably (ABR)