Table 2.

Attributes and Their Levels in the DCE Questionnaire

Attributes	Description to Physicians	Levels	Criteria
Disease control rate	Tumor lesions are reduced in size or stable	30%
		55%
		80%
Nausea & vomiting	Various degrees of nausea and vomiting caused by treatment	Strongly Severe	Hard to control
		Severe	Necessary to treat
		Moderate	Intermittent vomiting
		Mild	Nausea
Risk of side effects	Decrease in platelets or leukopenia and abnormal liver function caused by treatment	High	Severe side effects
		Medium	Moderate side effects
		Low	Slight side effects
Out-of-pocket costs	The monthly medical expenses that patients are willing to pay during the treatment	CNY 9000
		CNY 6000
		CNY3000