Questioning willingness to pay
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Influenza virus vaccination Elderly patients in Australia are willing to pay more for the intradermal influenza virus vaccine Intanza than they are for an intramuscular vaccine, according to Australian researchers.1 Discrete choice (DC) conjoint analysis was carried out with 90 participants aged ≥ 65 years who were presented with 11 pairs of choices to determine WTP for the two vaccines, and another choice used to detect ‘irrational’ trades. Each pair contained information on the vaccines’ efficacy, cost, adverse event profile and administration. After adjustment for demographic variables, it was determined that participants were willing to pay an additional $A26.80* for the intradermal vaccine than they were for the intramuscular vaccine. The majority (76%) of participants reported choosing this vaccine due to its efficacy, while only 14% reported choosing it due to the method of administration.**
French value postoperative pain relief. . . In France, researchers have found that avoidance of postoperative pain may have appreciable value to patients undergoing surgery.2 Their study used a contingent valuation method (CVM) to estimate WTP for treatment of postoperative pain in 108 patients undergoing laparotomy. Patients were asked before and after surgery to indicate their outof-pocket WTP for treatments that would reduce their postoperative pain by 20%, 50% and 80%. WTP for 20%, 50% and 80% postoperative pain reductions were not significantly different between preoperative questionnaires (€111.20, €184.70 and €265.30, respectively) and postoperative questionnaires (€113.00, €191.20 and €270.70, respectively). The researchers concluded that "avoidance of postoperative pain may have considerable value to patients undergoing a heavy surgery".
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CVM and DCE compared The last of these of these studies compared patient WTP values acquired through DC experimentation, with patient WTP values acquired through the CVM, for several health outcomes associated with mild-risk pregnancy at term.4 A mail questionnaire containing questions on health attributes (both WTP evaluation methods) and cost attributes (DC questions only) related to mild-risk pregnancy at term were sent to lay people via mail, of which 88 responses were analysed. The DC task was completed significantly faster and regarded as significantly easier than the CVM task. The DC task also derived almost three-fold higher WTP values than the CMV task, but had a poorer test-retest quality. It was concluded that DC experimentation yielded "no methodological benefits over the conventional CVM when measuring complex health states such as in obstetrics". * Australian dollars ** A cost-effectiveness study has also been performed for the intradermal influenza virus vaccine (see this issue; see PharmacoEconomics & Outcomes News 592 p5; 803001833) 1. Adams J, et al. Assessing the willingness-to-pay for intradermal influenza vaccination in Australia using discrete choice methodology. 12th Annual European Congress of the International Society for Pharmacoeconomics and Outco
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