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Nomogram based on the final multivariable logistic regression model to predict the probability of BOO in men ≥50 years of age with refractory LUTS. LUTS: lower urinary tract symptoms; IPSS: International Prostate Symptom Score; Qmax: maximum flow rate; PVR: postvoid residual; TPV: total prostate volume; TZI: transitional zone index; BOO: bladder outlet obstruction.
