Table 1.

Patients’ demographical characteristics.

	All participants (n = 42)
Age at diagnosis [median in months (range)]	6 (1–146)
Sex
Male	41 (98%)
Female	1 (2%)
Secondary diagnoses
Cardiac	4 (9%)
Gastrointestinal	2 (5%)
Syndromic	2 (5%)
Urogenital	3 (7%)
None	31 (74%)
FIA without perianal abscess at the timepoint of FIA diagnosis
Yes	7 (17%)
No	35 (83%)
Surgery for perianal abscess prior to FIA identification
Yes	17 (40%)
No	25 (60%)

FIA, fistula-in-ano.