Certification status of respondents in the two Delphi rounds
| Certification status | Delphi 1 | Delphi 2# |
| Trainee | 38 (10.1%) | 17 (7.0%) |
| Certified <5 years | 71 (19.1%) | 52 (21.3%) |
| Certified >5 years | 234 (63.1%) | 155 (63.5%) |
| Other (e.g. no certification, informal recognition) | 28 (7.5%) | 20 (8.2%) |
| Total | 371 | 244 |
#: Not all Delphi 2 respondents answered this question.