Fig. 2From: Bilateral posterior Quadratus Lumborum block for pain relief after cesarean delivery: a randomized controlled trialKaplan-Meier plot of time to first request for morphine (pain-free period) at the 2nd interim analysis, Log-rank overall p < 0.001. Abbreviations: IT, intrathecal; QLB, quadratus lumborum block; IV, intravenous; PCA, patient-controlled analgesia; h, hoursBack to article page