Table 2 Consumption of Rescue Analgesic Medications in the First 48 h Postoperative

Analgesia time, h

8.03 ± 3.66(n = 25)

10.24 ± 4.34(n = 20)

19.95 ± 2.78(n = 14)

P_a=0.057

The postoperative button-push

count for PCIA times

P_b<0.001*

P_c<0.001*

No request

7(21.9%)

12(37.5%)

18(56.2%)

 1–5

0(0%)

3(9.4%)

12(37.5%)

 6–10

5(15.6%)

11(34.4%)

2(6.3%)

P_a<0.001*

 > 10

20(62.5%)

6(18.8%)

0(0%)

P_b<0.001*

Cumulative morphine consumption in 1st 48 h postoperative, mg

13.12 ± 2.51

8.60 ± 2.85

4.14 ± 1.01

P_c<0.001*