Table 2. Distribution of patients according to PVR-R thresholds.

PVR-R (%)	BOO+/DUA+ (N° pts.)	BOO+/DUA− (N° pts.)	BOO−/DUA+ (N° pts.)	BOO−/DUA− (N° pts.)
0–20	33	35	86	30
21–40	21	13	26	3
41–60	27	14	17	0
61–80	25	5	10	0
81–100	34	10	21	0
Total pts.	140	77	160	33

PVR-R, post-void residual urine ratio; BOO, bladder outlet obstruction; DUA, detrusor underactivity.