OBJECTIVES: Time tradeoff (TTO) values of the EQ-5D-5L health states measured in China’s EQ-VT study varied across sampled locations. This might be a sign of different health preferences in those locations, or it might be a sign of salient interviewer effects or respondent’s differing understanding of the TTO task. Task understanding could be assessed in terms of individual-level inconsistency in valuation. Relating inconsistency to the characteristics of the respondent, interviewer, and interview can therefore help to understand the variations in values. METHODS: