Fig. 2From: Tailor-made proficiency curves in laparoscopic hysterectomy: enhancing patient safety using CUSUM analysisThreshold curves for blood loss, operative time, and adverse events. Horizontal axis represents amount procedures before flagging in case of out-of-control performance (OR 2.0 compared to average performance). When performing exactly on average, flagging will occur as frequent as depicted on the vertical axisBack to article page