Table 3. Comparison of cumulative morphine consumption between the groups.

Cumulative morphine	Groups
consumption	PECS II	PS	p-value
1st hour
Mean + SD	0	0 + 0	-
Median (min-max)	0 (0-0)	0 (0-0)
2nd hour
Mean + SD	0 0	0 + 0	-
Median (min-max)	0 (0-0)	0 (0-0)
4th hour
Mean + SD	2.36 + 0.78	0	0.001 a*
Median (min-max)	2 (2-4)	0 (0-0)
6th hour
Mean + SD	4.72 + 1.05	1.68 + 0.74	0.001
Median (min-max)	4 (4-8)	2 (0-2)
12th hour
Mean + SD	7.32 + 1.19	3.84 + 0.89	0.001 a**
Median (min-max)	8 (6-10)	4 (2-6)
24th hour
Mean + SD	9.04 + 1.09	5.4 + 1.01	0.001 a**
Median (min-max)	9 (8-12)	6 (4-8)

aMann–Whitney U-test, **p < 0.01.