Intervention and comparator intervention	Randomised/safety [N]	Deaths [N]	Deaths [%]	All adverse events [N]	All adverse events [%]	Severe/serious adverse events [N]	Severe/serious adverse events [%]
Barczynski 2012	I: total thyroidectomy	100	1	1	21	21	2	2
	C: bilateral subtotal thyroidectomy	100	0	0	35	35	3	3
Witte 2000	I: total thyroidectomy	50	‐	‐	10	20	1	2
	C1: bilateral subtotal thyroidectomy	50	‐	‐	16	32	0	0
	C2: Dunhill procedure	50	‐	‐	9	18	1	2
Jarhult 2005	I: total thyroidectomy	22	‐	‐	5	23	‐	‐
	C: subtotal thyroidectomy	21	‐	‐	1	5	‐	‐
Chi 2005	I: bilateral subtotal thyroidectomy	166	‐	‐	22	13.3	0	0
	C: Dunhill procedure	174	‐	‐	55	31.6	1	0.6
Muller 2001	I: bilateral subtotal thyroidectomy	67	0	0	14	21	1	1.5
	C: Dunhill procedure	85	0	0	18	21	2	2.3
‐ denotes not reported C: comparator intervention; I: intervention