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两组患者视觉模拟评分（VAS）的比较
Comparison of Visual Analogue Scale (VAS) between Group A and Group B (n=60, Mean±SD)
| Group | Before analgesia | 30 minutes after analgesia | 60 minutes after analgesia | 120 minutes after analgesia |
| *P < 0.05 vs before analgesia, #P < 0.05 vs group B. Group A: 0.2% ropivacaine 1 mL; Group B: 0.9% NS 1 mL. | ||||
| A | 7.93±1.02 | 3.70±0.98*# | 3.48±0.74*# | 3.68±0.91*# |
| B | 7.90±1.05 | 8.30±1.15 | 8.47±1.11 | 8.58±1.05 |
