Responses to EQ-5D-5L
Cancer
CANCER
The assimilation and contrast effects may explain the order effects on the EQ-5D-5L responses. If respondents answered a specific question before a general one, they may interpret the latter as having a similar meaning to the former, which is called the assimilation effect [For example, regarding usual activities, the specific questions’ contrast effect may help in explaining the difference in the responses between the groups with the EQ-5D-5L placed second and last; this is because most questions that would be related to usual activities overlap between the FACT-G and the EORTC QLQ-C30, such as GF1, GF2, and Q6; GF6 and Q7; and GP3 and Q26 (Table Questions in the FACT-G or the EORTC QLQ-C30 that may be related to the EQ-5D-5LThe question of the FACT-G or the EORTC QLQ-C30 should overlap with those of the other instrument in the same lineEORTC QLQ-C30, European Organization for Research and Treatment of Cancer Quality of Life Questionnaire Core 30; FACT-G, Functional Assessment of Cancer Therapy GeneralOne of the previous studies has examined and found assimilation effect of specific health questions on self-rated health question [