Table 3.

Intervention.

No	Study	Intervention
1	Crowther 2003 [7]	MgSO4 was intravenously administrated with a loading infusion of 4 g for 20 min followed by a maintenance infusion of 1 g/h for up to 24 h in the treatment group.
2	Marret 2006 [8]	MgSO4 was intravenously administrated with a loading infusion of 4 g over 30 min in the treatment group.
3	Mittrendorf 2002 [24]	MgSO4 was intravenously administrated with a loading infusion of 4 g in the treatment group.
4	Rouse 2008 [10]	MgSO4 was intravenously administrated with a loading infusion of 6 g for 20–30 min followed by a maintenance infusion of 2 g/h in the treatment group. If delivery had not occurred after 12 h and was no longer considered imminent, the infusion was discontinued and resumed when delivery was deemed imminent again.
5	Doyle 2014 [18]	Same as No.1
6	Chollat 2014 [19]	Same as No.2
7	Paradidis 2012 [20]	Same as No.1
8	Drassinower 2015 [21]	Same as No.4
9	Colon 2016 [22]	MgSO4 was intravenously administrated with a loading infusion of 4 g followed by a maintenance infusion of 2 g/h for up to 48 h in the treatment group. Additional 2 g boluses and rate increases of up to 4 g/h could be administrated at the discretion of the treating physician.
10	Wolf 2020 [23]	MgSO4 was intravenously administrated with a loading infusion of 5 g over 20–30 min, followed by a maintenance infusion of 1 g/h for up to 24 h in the treatment group.