Table 3.
Attribute selection and level setting
| Item | Category | N of studies in current review | % | Percentage of de Bekker-Grob et al. [15] | Percentage of Soekhai et al. [14] |
|---|---|---|---|---|---|
| Source of attributes and | Interviews, expert opinions | 8 | 44% | NCR | NCR |
| level assignment | Focus groups | 7 | 39% | NCR | NCR |
| Interviews and focus groups | 9 | 50% | NCR | NCR | |
| Pilot | 11 | 61% | NCR | NCR | |
| Number of attributes | 2–3 | 2 | 11% | 0.80 | 1.03 |
| 4–5 | 9 | 47% | 1.08 | 1.19 | |
| 6 | 5 | 26% | 1.00 | 1.15 | |
| 7–9 | 2 | 11% | 0.80 | 0.49 | |
| 10+ | 1 | 5% | 1.50 | 0.96 | |
| Attributes covered | Monetary measure | 16 | 89% | 1.66 | 1.78 |
| (by study) | Time | 6 | 33% | 0.66 | 0.86 |
| Risk | 8 | 44% | 1.45 | 1.01 | |
| Expected outcome | 4 | 22% | 0.41 | 0.94 | |
| Services | 16 | 89% | 1.28 | 2.57 | |
| Others | 9 | 50% | 3.35 | 1.05 | |
| Number of choices per | 4 or less | 12 | 67% | NCR | NCR |
| respondent | 5–8 | 3 | 17% | 0.42 | 0.58 |
| 9–16 | 3 | 17% | 0.44 | 0.31 | |
| > 16 | 1 | 6% | 0.30 | 0.38 | |
| Administration of survey | Online | 4 | 22% | NCR | 0.78 |
| Computer/laptop | 2 | 22% | 3.90 | NCR | |
| Paper | 9 | 56% | 0.83 | 2.42 | |
| Response rate (non-reported) | 8 | 44% | NCR | NCR | |
| Completion time (non-reported) | 11 | 61% | NCR | NCR |
NCR not clearly reported