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The table presents the number of patients who perceived chronic postsurgical pain at 1, 3, and 6 months after thoracotomy.
| Time after Surgery | Number of Patients (%) | Probability | ||
|---|---|---|---|---|
| PVB | KET | CON | ||
| 1 month | 32 (91) | 30 (100) | 32 (100) | 0.1 |
| 3 month | 29 (83) | 31(97) | 30 (97) | 0.1 |
| 6 month | 16 (48) | 26 (90) | 28 (90) | <0.001 |
Probability was calculated with the Freeman-Halton extension of Fisher’s exact test. CON denotes the control group, KET denotes ketamine group, PVB denotes paravertebral block group.
