Fig. 4From: Gasless robot-assisted transaxillary hemithyroidectomy (RATH): learning curve and complications(a) Cumulative sum (CUSUM) control chart for the robot-assisted transaxillary hemithyroidectomy drainage amount. (b) Moving average for the drainage volume. (c) Mean drainage amount by group. Abbreviations: *, Pāā¤ā0.05; **, Pāā¤ā0.01, ns, P>0.05Back to article page