. Author manuscript; available in PMC: 2021 Jan 1.

Published in final edited form as: Female Pelvic Med Reconstr Surg. 2020 Jan-Feb;26(1):56–60. doi: 10.1097/SPV.0000000000000641

Table 2:

Hiatus area measurements and strength outcomes (median [interquartile range]) among 453 vaginally parous women, by levator ani avulsion.

Outcomes	No levator ani avulsion (n=387)	Levator ani avulsion (n=66)	P value

Hiatus area measurements (cm²)
at rest	19.0 [16.0, 22.3]	25.1 [20.3, 28.9]	<.001
at maximum voluntary contraction	13.9 [11.9, 16.5]	20.6 [16.8, 23.5]	<.001
at maximum Valsalva	25.1 [19.6, 31.2]	34.6 [27.7, 40.5]	<.001

Genital hiatus (cm), measured on exam
at rest	2.0 [1.5, 2.5]	2.5 [2.0, 3.0]	<.001
strain	3.0 [2.5, 4.0]	4.0 [3.0, 4.5]	<.001

Strength
Change in hiatus area with voluntary contraction (rest minus contraction, cm²)	4.2 [2.2, 6.2]	3.7 [1.2, 6.2]	0.171
Peak pressure^a, cm H₂O (perineometry, averaged over 2 contractions)	28.5 [19.0, 42.5]	13.5 [9.8, 21.3]	<.001

Missing peak pressure in n=21 (15 due to latex allergy, 6 other reasons).