Scope of the core outcome set
| Core outcome set scope | n (%) |
| Health area | |
| Anaesthesia and pain control | 1 (1) |
| Blood disorders | 1 (1) |
| Cancer | 9 (12) |
| Cancer/child health | 1 (1) |
| Child health | 1 (1) |
| Child health/ ear, nose and throat | 1 (1) |
| Child health/gastroenterology | 1 (1) |
| Ear, nose and throat | 4 (5)* |
| Endocrine and metabolic | 3 (4) |
| Eyes and vision | 1 (1) |
| Gastroenterology | 6 (8) |
| Healthcare of older people | 2 (3) |
| Heart and circulation | 3 (4) |
| Heart and circulation and skin | 3 (4)* |
| Kidney disease | 2 (3) |
| Lungs and airways | 2 (3) |
| Mental health | 1 (1) |
| Neonatal care | 1 (1) |
| Neurology | 4 (5)† |
| Neurology/eyes and vision | 1 (1) |
| Orthopaedics and trauma | 6 (8) |
| Other | 2 (3) |
| Overweight/obesity | 1 (1) |
| Pregnancy and childbirth | 11 (14)‡ |
| Rehabilitation | 1 (1) |
| Rehabilitation and rheumatology | 1 (1) |
| Rheumatology | 2 (3) |
| Skin | 4 (5) |
| Tobacco, drugs and alcohol dependence | 1 (1) |
| Adults/children | |
| Adults | 45 (58) |
| Both adults and children | 18 (23) |
| Children | 11 (14) |
| Not reported | 4 (5) |
| Gender | |
| Male only | 2 (3) |
| Female only | 8 (10) |
| Both | 68 (87) |
| Intervention | |
| Any | 49 (63) |
| Drug | 4 (5) |
| Psychological | 3 (4) |
| Surgery | 7 (9) |
| Other§ | 15 (19) |
| Countries (all participants) | |
| 1 only | 11 (19) |
| 2–10 | 14 (24) |
| 11–10 | 8 (14) |
| 20–30 | 13 (22) |
| >30 | 13 (22) |
| Not reported/unclear | 19 |
*Includes articles reporting three COS studies.
†Includes articles reporting two COS studies.
‡Includes two articles reporting two COS studies.
§Other: active surveillance anaesthetic techniques; behavioural; chemoradiotherapy; extracorporeal membrane oxygenation (ECMO); gene therapy; haemodialysis; healthcare transition; interdisciplinary multimodal pain therapy; medication review; physical activity intervention; prepregnancy care; procedure (induction of labour); rehabilitation; sound-based interventions; and visual screening/assessment.