Table 1.

The 13 trials

Trial	Condition	Treatment	Target sample size rangea	Number of active UK sites (at time of writing)a	Timing of trial opening to recruitmentb
1	Renal	Dialysis	300–400	1–10		During pandemic
2	Renal	Dialysis	500–600	20–30	Pre-pandemic
3	Oncology	Surgery	None	10–20		During pandemic
4	Neurosurgery	Surgery	200–300	1–10		During pandemic
5	Orthopaedics	Surgery	400–500	10–20			Post-restrictions
6	Neurosurgery	Surgery	50–100	20–30		During pandemic
7	Orthopaedics	Surgery	300–400	1–10		During pandemic
8	Urology	Surgery	200–300	10–20	Pre-pandemic
9	Oncology	Surgery	750–1000	50–100	Pre-pandemic
10	Oncology	Chemotherapy	4000–5000	100 +	Pre-pandemic
11	Hepatobiliary	Surgery	5000 +	50–100	Pre-pandemic
12	Mental health	Medication	300–400	10–20		During pandemic
13	Surgery	Others	2000–3000	1–10	Pre-pandemic

^aWe have not given precise numbers as this would potentially identify trials

^bPandemic defined as from March 2020 to February 2022 when all legal UK restrictions were lifted