Fig. 1From: Association between sleep quality and nocturnal erection monitor by RigiScan in erectile dysfunction patients: a prospective study using fitbit charge 2Flow diagram for patient selection process. ED: Erectile Dysfunction, IIEF-5: International Index of Erectile Function-5, RigiScan: device for detecting Nocturnal Penile Tumescence and Rigidity (NPTR), Fitbit: Fitbit Charge 2™ for sleep monitor; Group A and Group B were the two groups based on the NPTR resultsBack to article page