Main Organiser

Julius Centre University of Malaya

Co-organiser

Department of Social and Preventive Medicine, Faculty of Medicine, University of Malay

Supported by

University of Malaya

INFLUENCES ON RESULTS CAUSED BY DIFFERENCES IN THE SURVEY METHODS USED FOR THE CONTINGENT VALUATION OF HEALTH CHECKUPS FOR METABOLIC SYNDROME

Author

Kumakawa T, Sugahara T

Institution

Department of Health and Welfare Services, National Institute of Public Health, Japan

Abstract

Objectives: There is little research providing a comparative evaluation of response bias in results due to differences in the survey methods used for contingent valuation. The objective of this study is to clarify the differences between three survey methods with common question items for residents of the same city.

Methods: Mail questionnaires, in-person interviews, and Internet surveys were carried out using the same survey forms, which asked about willingness to pay to have a health checkup for metabolic syndrome. The fundamental statistical values were calculated for the three surveys. The three survey methods were compared by the Kruskal Wallis test and then regression analysis was executed.

Results: The average willingness to pay was 1223.7 yen overall, 1148.3 yen in the Internet survey, 1286.2 yen in the mail survey, and 1247.0 yen in the interview surveys. The results of the Kruskal Wallis test clearly suggested that the results differed significantly depending on the survey method that was used. The results of the regression analysis suggested that there was no significant difference among the three survey methods.

Conclusion: Willingness to pay appears to differ according to the survey method. However, after controlling for the attributes of the respondents, no difference is seen.