patients not improved by operation could be detected pre-operatively by low resting ( p less than 0.05 ) , squeeze ( p less than 0.025 ) and strain ( p less than 0.05 ) anal pressure at 2 cm as well as by videoproctographic evidence of increased pelvic floor descent at rest ( p less than 0.01 ) , during contraction ( p less than 0.005 ) and straining ( p less than 0.005 ) , excessive perineal descent at rest ( p less than 0.05 ) , during contraction ( p less than 0.05 ) and during attempted defaecation ( p less than 0.05 ) and a short anal canal at rest ( p less than 0.05 ) and during straining ( p less than 0.025 ) .
C0003461
anal
C0227411
anal canal