Table 2.

Demographics and results of digital rectal exam, high resolution anorectal manometry, colonic transit, balloon expulsion test, and rectal area on scout film (RASF) in patients evaluated for constipation based on patients who underwent weight- or time-based balloon expulsion tests (wbBET or tbBET).

Characteristics	wbBET (n=211)	tbBET (n=61)	p value
Females, N (%)	165 (78.2)	53 (86.9)	0.12
Age (years)	40 [27; 53]	40 [27; 56]	0.85
Body mass index (kg/m2)	21.7 [19.2; 24.8]	22.7 [19.2; 26.8]	0.27
Rectal evacuation disorder, N (%)	43 (21.7)	18 (29.5)	0.64
Digital rectal exam findings
Absent perineal descent	116 (59.5)	38 (64.4)	0.50
Puborectalis tenderness	73 (34.6)	24 (39.3)	0.50
Increased resting anal tone	63 (30.7)	19 (32.2)	0.94
Decreased resting anal tone	27 (13.2)	8 (13.8)
Increased anal squeeze	12 (6.3)	5 (9.6)	0.64
Decreased anal squeeze	36 (18.9)	11 (21.2)
Paradoxical contraction	96 (52.8)	26 (44.1)	0.50
Impaired anal relaxation	9 (4.9)	3 (5.1)
Colonic transit on scintigraphy^
Geometric center 24 hours	1.9 [1.6; 2.4]	1.8 [1.6; 2.2]	0.37
Slow colonic transit at 24h	14/175	1/47	0.10
Geometric center 48 hours	2.7 [2.1; 3.8]	2.7 [2.1; 3.7]	0.90
Slow colonic transit at 48h	10/113	1/47	0.10
Anorectal manometry parameters
Max resting pressure (mmHg)	95.2 [77.1;112.9]	97.0 [82.4;114.8]	0.52
Max squeeze pressure (mmHg)	161.7 [120.2;207.9]	187.5 [134.6;227.4]	0.13
Recto-anal pressure gradient(mmHg)	−26.2 [−44.1;−7.7]	−41.0 [−71.3;−13.4]	0.002
Rectal area
RASF (cm2)	2.1 [0; 10.0]	3.3 [0; 10.0]	0.28

Data presented as N (%); median [interquartile range].

^{^}Normal colonic transit data based on measurements in 145 females and 75 males for geometric center (GC) 24, and 136 females and 63 males for GC 48:

Median (5th, 95th %) GC 24h: 2.3 (1.3, 4.4)

GC48h: 3.8 (1.9, 5.0)