Table 6.

Significant lower pain score at different time points after surgery.

Study, year	Time points in hour after surgery
	1	2	4	6	8	10	12	16	18	24	36	48	72
Dong et al.[14], 2017				*						*	*
Dutta et al.[15], 2017	*	*	*		*
Jabbary Moghaddam et al.[16], 2016	The incidence of postoperative pain was reported
Cai et al.[17], 2016	*		*		*		*	*		*
Priye et al.[18], 2015	*			*			*	*		*
Ren et al.[19], 2015	*		*		*			*		*
Ramsay et al.[20], 2014	*	*	*							*
Abdel-Meguid[21], 2013	*	*	*	*	*	*	*
Elhakim et al.[22], 2010				*			*		*	*
Ghandi et al.[23], 2005		*	*	*	*	*	*
Wahlander et al.[24], 2005		*	*
Venn et al.[25], 1999	Pain was not reported

Note for interpretation:

^*Pain score was significantly lower in the DEX group at (the desired hour) after surgery in comparison with the control group.