Three-dimensional endoanal ultrasonographic assessment of an anal fistula with and without H2O2 enhancement

Table 1 Results of physical examination and 3D-EAUS findings in the identification of the primary fistula tract

	Classification based on surgical findings			Overall accuracy
	Intersphincteric (n = 26)	Transsphincteric (n = 34)	Suprasphincteric (n = 4)
Physical examination
Intersphincteric	201	9	0
Transsphincteric	7	231	2	68.7% (44/64)a
Suprasphincteric	0	2	11
3D-EAUS
Intersphincteric	241	4	0
Transsphincteric	4	291	1	84.4% (54/64)b
Suprasphincteric	0	1	11
H2O2 3D-EAUS
Intersphincteric	241	3	0
Transsphincteric	2	301	1	89.1% (57/64)c
Suprasphincteric	0	1	31

Data represent number of primary tracts.

¹Absolute agreement; P = 0.037 between a and b, P = 0.005 between a and c, P = 0.435 between b and c.