Influence of night duty on endoscopic therapy for bile duct stones

Figure 1 Disposition of patients in the study. Among 335 patients treated by endoscopic therapy for bile duct stones in five years at our hospital, 167 underwent initial endoscopic therapy. The data from 133 patients treated by eight endoscopists who sometimes worked night shifts were evaluated in this study. These 133 cases included 34 patients treated by endoscopists after they had been on night duty the previous day (ND group) and 99 treated by the same endoscopists when they had not been on night duty the previous day (DD group). ND: Night duty; DD: Day duty.