| 组别 | 例数 | 镇痛泵药液用量 | 补救镇痛次数 | 
| A | 25 | 100 (94,109) | 2 (1,3) | 
| S1 | 25 | 90 (88,98) | 1 (1,2) | 
| S2 | 25 | 90 (88,96) | 1 (0,1)a | 
| S3 | 25 | 56 (54,66)abc | 0 (0,0)ab | 
| χ2 | 
 | 51.416 | 31.109 | 
| P | 
 | 0.000 | 0.000 |