Intervention and comparator intervention	Randomised/safety [N]	Left study due to adverse events [N]	Left study due to adverse events [%]	Hospitalisation [N]	Hospitalisation [%]	Outpatient treatment [N]	Outpatient treatment [%]
Barczynski 2012	I: total thyroidectomy	100	1	1	‐	‐	‐	‐
	C: bilateral subtotal thyroidectomy	100	0	0	‐	‐	‐	‐
Witte 2000	I: total thyroidectomy	50	‐	‐	‐	‐	‐	‐
	C1: bilateral subtotal thyroidectomy	50	‐	‐	‐	‐	‐	‐
	C2: Dunhill procedure	50	‐	‐	‐	‐	‐	‐
Jarhult 2005	I: total thyroidectomy	22	‐	‐	‐	‐	‐	‐
	C: subtotal thyroidectomy	21	‐	‐	‐	‐	‐	‐
Chi 2005	I: bilateral subtotal thyroidectomy	166	‐	‐	9	5.4	‐	‐
	C: Dunhill procedure	174	‐	‐	15	8.6	‐	‐
Muller 2001	I: bilateral subtotal thyroidectomy	67	‐	‐	‐	‐	‐	‐
	C: Dunhill procedure	85	‐	‐	‐	‐	‐	‐
‐ denotes not reported C: comparator; I: intervention