Table 2: BOOI ranking of PV US, PV DRE, PSA, IPSS, and PVR means.

      Kruskal-Wallis test    PV-US (cc)
   
   PV-DRE (cc)
   
BOOI PSA
(ng/dL)
IPSSPVR
(mL)
Mean (cc)SDMean (cc)SD

Nonobstructed
(<20)
121.561529.819.42010
Inconclusive
(20–40)
142.383043.233.13515
Obstructed
(>40)
224.51712053.632.96015

BOOI: bladder outlet obstruction index.
PV: prostate volume.
US: transabdominal ultrasound.
DRE: standardized digital rectal examination.
SD: standard deviation.
IPSS: international prostatic symptom score.
PVR: postvoiding residue.