[Volumes of total prostate and transitional zone are positively correlated with age in benign prostatic hyperplasia...

To investigate the total prostate volume (TPV) and prostate transitional zone volume (TZV) in different age groups of benign prostatic hyperplasia patients, calculate the transitional zone index (TZI), and analyze correlation of age with the above parameters.

We divided 1,563 BPH patients into 4 age groups (50-59, 60-69, 70-79 and 80-89 y), measured their TPV and TZV by rectal ultrasonography, calculated their TZI and evaluated all the data obtained by statistical analysis.

The TPV, TZV and TZI of the BPH patients were shown to be (32.27 +/- 15.76) ml, (9.55 +/- 98) ml and 0.28 +/- 0.13 in the 50-59 y group; (40.93 +/- 17.45) ml, (14.94 +/- 11.83) ml and 0.34 +/- 0. 16 in the 60-69 y group; (46.56 +/- 20.31) ml, (19.54 +/- 19.25) ml and 0.39 +/- 0.16 in the 70-79 y group; and (47.85 +/- 26.63) ml, (20.40 +/- 16.78) ml and 0.41 +/- 0.19 in the 80-89 y group. Both TPV and TZV were positively correlated with the patients' age, (r1 = 0.232, r2 = 0.256).

TPV and TZV increase with age in BPH patients, the latter even more obviously than the former.