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. 2018 Jan 2;13(1):e0190354. doi: 10.1371/journal.pone.0190354

Table 2. Duration of analgesia in children who received caudal magnesium in addition to ropivacaine in comparison with that in children who received ropivacaine alone.

	Magnesium group		Control group
Reference	Patients, n	Duration of analgesia, min	Patients, n	Duration of analgesia, min	p-value
Elshal 2009 [19]	20	222 ± 42^a	20	192 ± 54^a	> 0.05
Kim 2014 [20]	39	485 (345–650)^b	38	390 (360–660)^b	0.74
Yousef 2014 [21]	35	480 (330–660)^c	35	240 (180–300)	< 0.001
Sridhar 2017 [16]	32	325 ± 46^a	32	286 ± 53^a	< 0.001
Askar 2017 [17]	30	916 ± 103^a	30	360 ± 139^a	< 0.001

^aMean ± standard deviation.

^bmedian (interquartile range).

^cmedian (95% confidence interval).