Table 2.

Patient-controlled intravenous analgesia

Parameters	Time points	Group S	Group OS1	Group OS2	Group O	P1	P2	P3	P4	P5	P6	P0
The number of PCIA boluses	6 h	5.4 (4.2)*	5.0 (3.7)*	3.2 (1.4)	1.6 (0.5)	0.043	0.000	0.000	0.020	0.569	0.004	0.000
	12 h	10.9 (8.8)*	9.0 (5.5)*	5.7 (2.6)	2.9 (0.8)	0.049	0.000	0.000	0.024	0.162	0.000	0.000
	24 h	17.2 (14.0)*	15.4 (10.0)*	10.5 (5.5)	4.8 (1.2)	0.021	0.000	0.000	0.045	0.432	0.006	0.000
The amount of opioid consumption	6 h	15.8 (6.3)*	14.7 (5.8)*	11.8 (2.5)	8.7 (1.3)	0.010	0.000	0.000	0.002	0.363	0.001	0.000
	12 h	32.0 (2.5)*	28.5 (11.8)*	23.5 (6.6)	17.7 (2.2)	0.021	0.000	0.000	0.041	0.153	0.001	0.000
	24 h	52.4 (18.4)*	48.2 (16.8)*	40.9 (9.7)	33.0 (2.6)	0.029	0.000	0.000	0.043	0.233	0.002	0.000

Notes: Group S (sufentanil 100 μg), group OS1 (sufentanil 70 μg, oxycodone 30 mg), group OS2 (sufentanil 50 μg, oxycodone 50 mg), and group O (oxycodone 100 mg). Ramosetron 0.3 mg was added to each group. In all groups, the drugs were diluted to 100 mL. Values are expressed as mean ± SD.

^*P<0.05. P₁, group O vs group OS2; P₂, group O vs group OS1; P₃, group O vs group S; P₄, group OS1 vs group OS2; P₅, group S vs group OS1; P₆, group S vs group OS2; P₀, comparing groups.

Abbreviation: PCIA, patient-controlled intravenous analgesia.