Time Period: | ||
WTP Units: | Total | Monthly |
$US | Please type the maximum dollar amount you think you would be willing and able to pay for this treatment. $_____ (please enter only one amount) | Please type the maximum dollar amount you think you would be willing and able to pay per month for this treatment. $_____ per month. (please enter only one amount) |
% financial resources | Please type the maximum percentage of your financial resources you think you would be willing and able to pay for this treatment. _____ % of my financial resources. (please enter a number between 0 and 100) | Please type the maximum percentage of your financial resources you think you would be willing and able to pay per month for this treatment. _____% of my financial resources per month. (please enter a number between 0 and 100) |
% Total | % Monthly | $ Total | $ Monthly | ||
n=208 | n=246 | n=243 | n=209 | ||
35% | 44% | 43% | 55% ** | ||
Skewness | |||||
BKA | 0.81 ** | 1.24 ** | 7.64 ** | 2.93 ** | |
Paraplegia | 0.07 | 0.72 ** | 5.42 ** | 2.00 ** | |
Kurtosis | |||||
BKA | 2.74 | 3.97 * | 70.77 ** | 15.19 ** | |
Paraplegia | 1.82 ** | 2.61 | 38.68 ** | 8.77 ** | |
Spearman rank correlation coefficients for WTP and income | |||||
BKA | 0.01 | 0.07 | 0.30 ** | 0.33 ** | |
Paraplegia | 0.12 | 0.14 * | 0.30 ** | 0.39 ** | |
WTP elicited as: | |||||
% Total | % Monthly | $ Total | $ Monthly | ||
BKA | Mean | 35 | 28 | 30,276 | 252 |
Median | 25 | 20 | 8,500 | 150 | |
(s.d.) | (28) | (23) | (91,947) | (289) | |
Paraplegia | Mean | 53 | 39 | 73,968 | 325 |
Median | 50 | 30 | 10,000 | 200 | |
(s.d.) | (30) | (27) | (209,814) | (324) | |
% respondents willing to pay more to cure paraplegia than to cure BKA (1) | 93% | 88% | 84% | 84% | |
Cohen's d effect size (2) | 0.70 | 0.57 | 0.24 | 0.35 | |
Sample size required (3) | 16 | 25 | 137 | 64 | |
1. Below-the-knee amputation. Include only respondents who gave different WTP values for the two health states. | |||||
2. Effect size, used in power analyses, for comparing difference in mean WTP for BKA and paraplegia for each of the elicitation versions. | |||||
3. Sample size that would be needed to detect the difference in mean WTP with 80% power and 5% alpha level for each of the elicitation versions. |