Table 1.

Characteristics at baseline for the 1276 patients with clinical and genetic information.

Gender
Male	628 (49.2%)
Female	648 (50.8%)
Age
Median, q25–q75, min–max	37.8, 26.1–50.3, 16.2–85.5
Stenosis	425 (33.3%)
Non-perianal fistula	171 (13.4%)
Perianal fistula	245 (19.2%)
Behavior
B1	669 (52.4%)
B2 (stenosis but no fistula)	248 (19.4%)
B3 (fistula)	359 (28.1%)
Follow-up time (years)
Median, q25–q75, min–max	6.8, 3.6–9.1, 0–11.6