Table 1.
Descriptive information of the panelists (n = 52)
| Country in which they mainly work | The Netherlands | 14 |
| USA | 10 | |
| Canada | 6 | |
| UK | 6 | |
| Australia | 3 | |
| Denmark | 2 | |
| France | 2 | |
| Germany | 2 | |
| Switzerland | 2 | |
| Belgium | 1 | |
| Finland | 1 | |
| Hong Kong | 1 | |
| Italy | 1 | |
| Spain | 1 | |
| Reason for invitationa | PubMed or EMBASE search | 4 |
| Author of review on non-PROMs | 3 | |
| Author of methodological paper on reliability | 16 | |
| Representative of relevant organization | 18 | |
| Own network only | 9 | |
| Nominated by invited panelist | 4 | |
| Professional backgrounda, b | Methodologist | 25 |
| Psychometrician | 18 | |
| Epidemiologist | 17 | |
| (Bio)statistician | 15 | |
| Allied health care professional | 10 | |
| Medical doctor | 7 | |
| (Clinical) psychologist | 4 | |
| Clinimetrician | 2 | |
| Other | 3 | |
| Ever used one of the COSMIN tools? | Yes | 29 |
| No | 23 |
a multiple answers allowed, b 56% of the panelists indicated to have more than one profession (up to 5)