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Results of anal vector manometry in patients with or without rectal prolapse (patients with anal sphincter defects included).
| Rectal prolapse | No rectal prolapse | p | |
| number of patients | 23 | 21 | |
| Mean (SEM) anal resting pressure (cm H2O) | 45 (7) | 67 (11) | 0.08 |
| Mean (SEM) anal squeeze pressure (cm H2O) | 88 (13) | 114 (16) | 0.2 |
| Mean (SEM) ASAI at rest (%) | 30 (3) | 20 (2) | 0.0046 |
| Mean (SEM) ASAI during squeezing (%) | 25 (2) | 20 (2) | 0.19 |
(ASAI: anal sphincter asymmetry index)
