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Table 2 Changes in the quantity of opiate patient-controlled analgesia (PCA) usage between successive 24 hours intervals, during the first 96 hours following TASF (SD, standard deviation)

From: Postoperative pain relief using intermittent intrapleural analgesia following thoracoscopic anterior correction for progressive adolescent idiopathic scoliosis

After surgery Mean opiate usage Difference Significance
(Hours) (μg/kg) ± SD   (p < 0.01)
0 – 24 445 ± 365   
24 – 48 841 ± 300 Increased p < 0.0001
24 – 48 841 ± 300   
48 – 72 565 ± 307 Decreased p = 0.0002
48 – 72 565 ± 307   
72 – 96 238 ± 314 Decreased p < 0.0001