Table 2 Image findings and physiological measurements

Defecographic findings

 CRAI (level I/II)

22 (9/13)

–

< 0.0001^†

 CRAI (level I/II) + rectocele

8 (5/3)

–

 Anterior rectoanal intussusception

–

4

 Anterior rectoanal intussusception + rectocele

–

5

 Rectorectal intussusception

–

6

 Rectocele alone

–

15

Endoanal ultrasound

 No sphincter defect

23

39

0.63^†

 Partial defect of internal anal sphincter

1

0

 Partial defect of external anal sphincter

3

5

 Not examined

3

6

Physiological measurements (left-lateral position)

 Anal canal length, cm

4.6 (3.2‒6.6)

4.5 (2.5‒6.5)

0.34*

 Maximum resting pressure, cm H₂O

51.5 (34.9‒124.8)

58.5 (19.0‒114.4)

0.98*

 Maximum squeeze pressure, cm H₂O

145.3 (65.1‒604.0)

150.5 (45.7‒366.7)

0.53*

 Defecation desire volume, ml

85 (50‒250)

80 (20‒280)

0.32*

 Maximum tolerated volume, ml

170 (80‒300)

200 (70‒3009

0.71*