Table 3.
Striated muscle layer thickness, fiber counts and fiber density
| Orientation within Urethra | 20–39 years | 70–89 years | Percent Difference | P value | |
|---|---|---|---|---|---|
| Thickness (Mean mm ± SD) (n) | 0 (n=28) | 3.44 ± 1.1 (12) | 2.62 ± 1.3 (16) | 23.8 | 0.092 |
| 45 (n-28) | 3.75 ± 1.0 (12) | 2.84 ± 1.8 (16) | 24.3 | 0.128 | |
| 90 (n=28) | 3.41 ± 1.4 (12) | 1.63 ± 1.7 (16) | 52.2 | 0.006 | |
| 135 (n=28) | 1.86 ± 1.2 (12) | 0.52 ± 1.0 (16) | 72.0 | 0.004 | |
| 180 (n=28) | 0.76 ± 0.8 (12) | 0.02 ± 0.1 (16) | 97.4 | 0.001 | |
| Fiber Count (mean ± SD) (n) | 0 (n=28) | 35.1 ± 16.3 (12) | 17.7 ± 11.1 (16) | 49.6 | 0.002 |
| 45 (n-28) | 36.3 ± 13.5 (12) | 17.3 ± 11.7 (16) | 52.3 | <0.001 | |
| 90 (n=28) | 26.5 ± 12.8 (12) | 6.6 ± 6.4 (16) | 75.1 | <0.001 | |
| 135 (n=28) | 16.3 ± 11.8 (12) | 2.4 ± 5.3 (16) | 85.3 | <0.001 | |
| 180 (n=28) | 6.8 ± 7.8 (12) | 0.1 ± 0.5 (16) | 98.5 | 0.002 | |
| Fiber Density (Mean fibers/mm ± SD) (n) | 0 (n=28) | 10.0 ± 3.8 (12) | 7.1 ± 2.3 (16) | 29.0 | 0.019 (28) |
| 45 (n-28) | 9.8 ± 3.2 (12) | 6.4 ± 2.6 (15) | 34.7 | 0.005 (27) | |
| 90 (n=28) | 7.7 ± 2.7 (12) | 4.3 ± 1.5 (11) | 44.2 | 0.001 (23) | |
| 135 (n=28) | 9.4 ± 1.1 (10) | 5.0 ± 2.8 (4) | 46.8 | 0.050 (14) | |
| 180 (n=28) | 12.5 ± 10.3 (9) | 8.0 (1) | 36.0 | - |
Note: The number of specimens for density changes because some specimens had no visible muscle layer to measure and division by zero is not possible.