Demographic, clinical, and manometric variables in 31 patients withParkinson's disease
| Sex (M/F) | 19/12 |
| Age (y) | 73 (22–89) |
| Constipation | 22/31 (71%) |
| Straining | 14/31 (45%) |
| Chronic laxative use | 10/31 (32.2%) |
| IAS pressure (mm Hg) | 50.5 (10–91) |
| MRV (ml) | 20 (0–40) |
| DST (ml) | 90 (10–600) |
| dyssynergia | 19/31 (61.3%) |
IAS=internal anal sphincter; MRV=minimum relaxation volume; DST=defecatory sensation threshold.