Risk factors for postoperative stoma outlet obstruction in ulcerative colitis

Table 1 Patient characteristics in the compared groups

	Overall (n = 148)	SOO (+) (n = 25)	SOO (-) (n = 123)	P value
Age1 (yr), (range)	48 (13-84)	50 (13-77)	48 (14-84)	0.614
Gender
Male	95 (64.2%)	18 (72.0%)	77 (62.6%)	0.372
Female	53 (35.8%)	7 (28.0%)	46 (37.4%)
Indication for surgery
Medical intractability	118 (79.7%)	16 (64.0%)	102 (82.9%)	0.032
Malignancy or dysplasia	30 (20.3%)	9 (36.0%)	21 (17.1%)
BMI1 (kg/m2), (range)	20.1 (11.7-36.1)	19.8 (14.8-25.5)	20.3 (11.7-36.1)	0.634
Mayo endoscopic score1 (range)	3 (0-3)	2 (0-3)	3 (0-3)	0.186
Extent of disease
Pancolitis	137 (92.6%)	24 (96.0%)	113 (91.9%)	0.691
Left-sided colitis	11 (7.4%)	1 (4.0%)	10 (8.1%)
Proctitis	0 (0.0%)	0 (0.0%)	0 (0.0%)
Disease duration1, (mo), (range)	33 (0-413)	40.5 (3-336)	33 (0-413)	0.535
Disease severity
Mild	25 (16.9%)	6 (24.0%)	19 (15.4%)	0.341
Moderate	71 (48.0%)	14 (56.0%)	57 (46.3%)
Severe	38 (25.7%)	4 (16.0%)	34 (27.6%)
Fulminant	14 (9.5%)	1 (4.0%)	13 (10.6%)
Total glucocorticoid dose from onset of UC to surgery2
10000 mg or more	9 (7.3%)	2 (10.0%)	7 (6.7%)	0.637
Less than 10000 mg	115 (92.7%)	18 (90.0%)	97 (93.3%)
Total glucocorticoid dose 1 mo before surgery1 (mg), (range)	0 (0-1720)	0 (0-765)	0 (0-1720)	0.026
Preoperative total protein level1 (g/dL), (range)	6.4 (2.5-9.3)	6.8 (4.5-9.3)	6.3 (2.5-8.6)	0.048
Preoperative albumin level1 (g/dL), (range)	3.2 (1.4-4.9)	3.6 (2.0-4.6)	3.1 (1.4-4.9)	0.203
Preoperative white blood cell count1 (cells/μL), (range)	7455 (1850-20080)	7500 (2660-16670)	7450 (1850-20080)	0.543
Preoperative C-reactive protein level1 (mg/dL), (range)	1.4 (0.0-32.4)	1.1 (0.0-8.8)	1.57 (0.0-32.4)	0.335
Onodera Prognostic Nutritional index1 (range)	37.8 (15.9-57.5)	39.3 (29.2-56.9)	37.6 (15.9-57.5)	0.274

¹Variables are indicated by median.

²Variable is unknown in 24 patients. BMI: Body mass index; UC: Ulcerative colitis.