Table 1.

Patient Parameters

Fistula Parameters	Internal Opening Found (n=133)	Internal Opening Not Found (n=49)	Test of Significance (Fisher’s Exact Test/Student’s t-test)
Male/Female	109/24	45/4	P=0.11
Age (years)	39.3 ±10.8	41.5 ±12.1	P=0.99
Recurrent fistula	42 (31.5%)	19 (38.8%)	P=0.38
Multiple tracts	94 (70.7%)	28 (57.1%)	P=0.10
Horseshoe tract	54 (40.6%)	14 (28.6%)	P=0.16
	Anterior-17	Anterior-2
	Posterior-34	Posterior-12
Supralevator + Suprasphincteric fistula	29 (21.8%)	7 (14.3%)	P=0.30
Fistula Complexity St James’s University Hospital (SJUH) Classification	Simple	Simple	P=1.0
	(Grade I +II)	(Grade I +II)
	5+27=32 (24.1%)	0+13=13 (26.5%)
	Complex	Complex
	(Grade -III+IV+V)	(Grade -III+IV+V)
	2+70+29= 101 (75.9%)	0+29+7=36 (73.5%)
Parks Classification	Simple	Simple	P=1.0
	(Grade I)	(Grade I)
	32 (24.1%)	13 (26.5%)
	Complex	Complex
	(Grade -II + III+IV)	(Grade -II+ III+IV)
	72+29+0=101(75.9%)	28+8+0=36 (73.5%)

Note: P<0.05 was considered statistically significant.