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. 2016 May 10;11(5):e0155114. doi: 10.1371/journal.pone.0155114

Table 11. Effect of intrathecal administration of morphine on persistent pain at 3 months following delivery among patients who had spinal anesthesia only.

Variables Morphine p value
(–) (+)
Persistent pain (+) No. (%) 7 (58.3) 50 (26.9) 0.0416
Total No. 12 186
Dose of intrathecal Bupivacaine (ug/kg) Mean (SD) 199 (32) 195 (26) 0.442
    Fentanyl (ng/mL) Mean (SD) 166 (27) 162 (22) 0.442
    Morphine (ng/mL) Mean (SD) 0 1624 (216) <0.0001