Table 2:

Distribution of Anorectal Pressures in 47 Healthy Males with a Normal Balloon Expulsion Test

Variable	Men with Normal BET (n = 47)		Relationship with BMI a	Relationship with age a
	Mean ± SD	10th, 90th percentile
Anal resting pressure	83 ± 25	54, 111	ns	−0.49 e
Anal HPZ length (cm)	3.9 ± 0.8	2.9, 4.8	ns	Ns
Anal squeeze pressure b	257 ± 78	164, 366	ns	Ns
Anal squeeze increment b, c	174 ± 81	90, 328	ns	Ns
Anal squeeze duration (s) d	14 ± 7	3, 21	ns	Ns
First sensation (mL)	44 ± 26	20, 72	ns	Ns
Urgency (mL)	74 ± 34	40, 120	ns	Ns
Discomfort (mL)	123 ± 53	60, 212	ns	Ns
Balloon expulsion time (s)	12 ± 12	3, 30	ns	Ns
Simulated evacuation without rectal distention
Rectal pressure	47 ± 36	21, 87	ns	0.39 e
Anal pressure	105 ± 44	55, 152	ns	Ns
Rectoanal gradient	−58 ± 53	−128, −1	ns	Ns
% Anal relaxation	5 ± 29	−32, 44	ns	Ns
Simulated evacuation with rectal distention
Rectal pressure	152 ± 60	76, 222	ns	0.37 f
Anal pressure	96 ± 43	47, 156	ns	Ns
Rectoanal gradient	56 ± 65	−36, 143	ns	0.37 f
% Anal relaxation	−1 ± 32	−47, 37	ns	Ns
Valsalva without rectal distention
Anal Pressure	173 ± 65	104, 258	ns	Ns

Values are mm Hg unless stated otherwise.

^aSpearman correlation coefficient,

^bThese values are derived from the squeeze maneuver with the highest squeeze pressure

^cSqueeze increment is (anal squeeze pressure – anal resting pressure)

^dAverage squeeze duration of 3 maneuvers.

^eP < 0.01,

^fP < 0.05; HPZ – high pressure zone. ns – not significant