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The effectiveness of each PIEB volume
| PIEB bolus volume(mL) | Rate of effective analgesia n(%) | |
|---|---|---|
| Group A(n = 52) | group B(n = 51) | |
| 7 | 0(0) | 0(0) |
| 8 | 1(50.00%) | 6(50.00%) |
| 9 | 1(25.00%) | 23(88.46%) |
| 10 | 17(70.83) | 10(90.91%) |
| 11 | 21(100.0%) | 1(100.00%) |
| 12 | 0(0) | 0(0) |
