Table 1. Age-adjusted demographic characteristics of the study subjects according to waist circumference and BMI.
| Waist circumference ≤ 90 cm | Waist circumference > 90 cm | BMI < 22 kg m−2 normal | BMI 23–24.9 kg/ m−2 overweight | BMI ≥ 25 kg/ m−2 obese | |
|---|---|---|---|---|---|
| Number | 446 | 156 | 209 | 178 | 215 |
| Prostate volume (cm3) | 31.6 ± 11.4 | 34.7 ± 14.2* | 31.4 ± 11.0 | 32.5 ± 11.5 | 33.4 ± 13.8 |
| PSA (ng mL−1) | 1.96 ± 1.94 | 1.73 ± 1.51* | 1.61 ± 1.20 | 1.79 ± 1.31 | 1.82 ± 1.32 |
| IPSS (total score) | 16.8 ± 6.9 | 17.4 ± 6.3 | 17.2 ± 7.6 | 16.7 ± 6.2 | 16.9 ± 7.0 |
| Qmax (mL s−1) | 16.7 ± 8.0 | 12.1 ± 4.9 | 21.7 ± 8.5 | 11.8 ± 6.4 | 12.8 ± 9.5 |
| DM (%) | |||||
| Yes | 15.7 | 26.3≜ | 18.2 | 16.3 | 20.5 |
| No | 84.3 | 73.7 | 81.8 | 83.7 | 79.5 |
| HTN (%) | |||||
| Yes | 33.0 | 50.0≜ | 29.2≜ | 35.4≜ | 46.5≜ |
| No | 67.0 | 50.0 | 70.8 | 64.6 | 53.5 |
Abbreviations: BMI, body mass index; PSA, prostate-specific antigen; IPSS, International Prostate Symptom Score; DM, diabetes mellitus.
The values for prostate volume, PSA, IPSS, QOL and Qmax are expressed as means ± s.d.
*P < 0.05 by unpaired t-test, compaired with the group of Waist circumference ≤ 90 cm; ≜P < 0.05 among three groups by χ2-test.