Table 2. Example of the dominant choice set.

Attribute	Service A	Service B
Preventive service time	Vacation*	Workday†
Preventive effectiveness	Very high‡	High§
Distance¶ (minute)	≤10	10–25
OOP service cost (CNY)	30	60
Which service would you choose?	□ Service A	□ Service B
	□ Neither (no preference for either and quit)

^*Usually weekends and statutory holidays

^†Non vacation

^‡The probability of reduction in caries is higher than 90%

^§The probability of reduction in caries is 80%-90%

^¶The driving time to the healthcare institution by public transport, including bus, subway, etc.

CNYChinese yuanOOPout-of-pocket