Fig. 4From: An umbrella review of the surgical performance of Harmonic ultrasonic devices and impact on patient outcomesSummary of (A) intraoperative blood loss and (B) drainage volume meta-analyses comparing Harmonic devices to conventional comparators. Mean difference is defined as (Harmonic value – comparator value). The n-values are n patients included. Asterisks (*) indicate a significant association (p < 0.05)Back to article page