Table 3 Demographic and clinical characteristics - grouped by baseline surgery information

N (%)

499

119 (23.8%)

380 (76.2%)

Age (years), mean (SD)

32.3 (11.43)

37.3 (11.95)

30.8 (10.81)

Male, n (%)

348

91 (76.5%)

257 (67.6%)

BMI (kg/m²), mean (SD)

19.10 (3.198)

18.81 (3.119)

19.19 (3.223)

Age at disease onset (years), mean (SD)

27.9 (10.63)

30.8 (10.98)

27.0 (10.37)

Age group at disease onset (years), n (%)

 N

499

119

380

  ≤ 16

29 (5.8%)

6 (5.0%)

23 (6.1%)

 17–39

401 (80.4%)

84 (70.6%)

317 (83.4%)

  ≥ 40

69 (13.8%)

29 (24.4%)

40 (10.5%)

Age at initial definite diagnosis (years), mean (SD)

30.6 (11.01)

34.1 (11.45)

29.5 (10.66)

Time from disease onset to initial diagnosis (months), mean (SD)

32.0 (46.43)

39.4 (47.57)

29.6 (45.89)

Time from initial diagnosis to enrollment (months), mean (SD)

20.6 (39.06)

39.3 (61.42)

14.8 (26.24)

Time from disease onset to enrollment (months), mean (SD)

52.6 (59.08)

78.6 (73.29)

44.4 (51.32)

Nicotine use history, n (%)

 N

442

99

343

 Never used

382 (86.4%)

83 (83.8%)

299 (87.2%)

 Current user

36 (8.1%)

11 (11.1%)

25 (7.3%)

 Former user

24 (5.4%)

5 (5.1%)

19 (5.5%)

Alcohol use history, n (%)

 N

443

99

344

 Never used

401 (90.5%)

84 (84.8%)

317 (92.2%)

 Current user

22 (5.0%)

8 (8.1%)

14 (4.1%)

 Former user

20 (4.5%)

7 (7.1%)

13 (3.8%)

Location, n (%)

 N

493

115

378

 L1

137 (27.8%)

27 (23.5%)

110 (29.1%)

 L2

71 (14.4%)

21 (18.3%)

50 (13.2%)

 L3

277 (56.2%)

65 (56.5%)

212 (56.1%)

 L4

8 (1.6%)

2 (1.7%)

6 (1.6%)

Behavior, n (%)

 N

495

115

380

 B1

247 (49.9%)

27 (23.5%)

220 (57.9%)

 B2

148 (29.9%)

38 (33.0%)

110 (28.9%)

 B3

100 (20.2%)

50 (43.5%)

50 (13.2%)

Perianal disease, n (%)

144 (28.9%)

20 (16.8%)

124 (32.6%)