Item | Specification | Number of studies |
---|---|---|
Methods for attributes and levels selection | Literature review, expert’s opinion | 3 |
Literature review, expert’s opinion, qualitative worka | 3 | |
Literature review, expert’s opinion, existing data | 2 | |
Literature review, expert’s opinion, existing research | 1 | |
Literature review, qualitative worka | 10 | |
Literature review, existing research | 2 | |
Literature review, existing data | 1 | |
Qualitative work only | 2 | |
Based on existing research | 3 | |
Pilot testing | Yes | 18 |
No | 1 | |
Not reported | 8 | |
Number of attributes | 3 | 1 |
4 | 4 | |
5 | 10 | |
6 | 6 | |
7 or more | 6 | |
Average number of attributes | 5 to 6 | |
Attributes coverede | Procedure attributes | 26 |
Cost attributes | 18 | |
Outcome attributes | 14 | |
Other | 7 | |
Number of levels | 2 to 3 | 13b |
2 to 4 | 6c | |
2 to 5 | 5d | |
3 to 4 | 2 | |
4 to 6 | 1 | |
Labelling | Generic | 16 |
Labelled | 6 | |
Both | 1 | |
Not clearly reported | 4 | |
Number of alternatives (not including opt-out option) | 1 | 2 |
2 | 20 | |
3 | 4 | |
4 or more | 1 | |
Opt-out option | Yes | 15 |
No | 12 |