| Respiratory medicine | Cardiology | Geriatrics | Other specialty | Physician in training | Total | |
| None | 13 (19.4) | 74 (73.3) | 8 (44.4) | 14 (53.8) | 104 (61.5) | 238 (57.2) |
| Absolute contraindications | 24 (35.8) | 12 (11.9) | 3 (16.7) | 6 (23.1) | 39 (23.1) | 86 (20.7) |
| Relative contraindications | 43 (64.2) | 19 (18.8) | 8 (44.4) | 7 (26.9) | 42 (24.9) | 129 (31.0) |
| Total number of doctors | 67 | 101 | 18 | 26 | 169 | 416 |
Data are presented as n (%) or n.The individual doctors could specify both absolute and relative contraindications. #: data from general practice participants (n=11) and other doctors (n=24) or very incomplete answers (n=81) are not presented, but complete results from these doctors and a copy of the questionnaire are available from the corresponding author.