Table 10.
Indifference values, VSLYs, and GDP multiple across conditions (maximum confidence level that participant fully understood the question)
| WTP_small | WTP_large | WTA_small | WTA_large | |
|---|---|---|---|---|
| Price: mean | 329 | 1493 | 641 | 2543 |
| Price: median | 75 | 249 | 498 | 1246 |
| Price: 95% CI | (− 13)–162 | (− 170)–669 | 398–598 | 758–1733 |
| VSLY: mean | 16,455 | 74,633 | 32,072 | 127,167 |
| VSLY: median | 3737 | 12,457 | 24,914 | 62,285 |
| VSLY: 95% CI | (− 639)–8113 | (− 8523)–33,437 | 19,904–29,924 | 37,914–86,656 |
| GDP multiple (ratio of VSLY median to per capita income), tested against WHO recom-mendationa | 2.0 (p val = 0.03) | 6.5 (p val = 0.02) | 13.5 (p val < 0.001) | 33.5 (p val < 0.001) |
| Observations | 258 | 275 | 278 | 259 |
WTP_small indicates WTP elicitation using a small-range price list, etc. Entries in PPP adjusted 2017 international $. Price stands for the amount respondents are willing to pay or receive on an annual basis. The 95% Confidence Interval is constructed around the median, using the standard built-in procedure (the centile command) in Stata. The GDP per capita annual income in PPP dollar in Burkina Faso is $1862 in 2017
aThe median VSLY is tested against the WHO-recommended three times per capita income, non-parametric two-sided sign tests