Table 2. Properties of Intraoperative and Postoperative Analgesia in Three Groups ^{a, b, c}.

Time	Sufentanil	Fentanyl	Placebo	p1	p2	p3
Analgesia time, min	171 ± 19	168 ± 28	122 ± 20	0.0001	0.0001	0.542 b
Effective analgesia time, min	214 ± 22	163 ± 21	146 ± 14	0.0001	0.012	0.0001
Immobilization time, min	226 ± 27	209 ± 14	159 ± 17	0.0001	0.0001	0.009
First opioid request, hr	4.9 ± 1.3	4.2 ± 2	3.8 ± 1.1	0.0001	0.156 b	0.057 b
Dose of opioid, mg	1 ± 0.6	1.1 ± 0.3	2 ± 0.6	0.0001	0.024	0.75 b
Pain Score, VAS
1st hour	1.6 ± 0.7	3 ± 1.2	3.3 ± 1	0.0001	0.341 b	0.0001
2nd hour	3.9 ± 1.8	4.6 ± 1.6	5.7 ± 1.7	0.0001	0.0001	0.0001
6th Hour	4.5 ±2	5.4 ± 1.8	6.9 ± 2.7	0.0001	0.0001	0.004
12th hour	5.4 ± 2	5.5 ± 2.1	7.7 ± 3	0.0001	0.0001	0.033
18th hour	5.2 ± 1.8	5.9 ± 1.6	7.8 ± 1.9	0.0001	0.0001	0.0001
24th hour	5.7 ± 1.2	6.3 ± 1.9	7.3 ± 2	0.0001	0.003	0.012

^a data are presented as Mean ± SD.

^b VAS, Visual Analogue Scale; p¹, Sufentanil vs. Placebo; p², Fentanyl vs. Placebo; p³, Sufentanil vs. Fentanyl.

^c P value > 0.05.