Graphical representation of the cumulative area under the curve of the pooled (weighted) mean pain scores at rest, as measured by the visual analog scale (0 to 10 cm) over time (four time points). The pooled rest pain scores from 969 patients (13 trials) were used to calculate the mean difference in rest pain between the suprascapular and interscalene blocks over the first 24 h after shoulder surgery. PACU = postanesthesia care unit.