Efficacy and safety of plastic and metal stents for endoscopic ultrasound guided-biliary drainage in elderly patients

Table 1 Patient characteristics, median (interquartile range)/n (%)

	PS group (n = 51)	MS group (n = 13)	P value
Age, years	78 (73-83)	79 (71-84)	0.79
Sex (male/female)	30/21	8/5	1.0
Performance status	0 (0-1.0)	0 (0-0.5)	0.49
Diseases (malignant/benign)	47/4	12/1	1.0
Pancreatic cancer	22	10
Biliary tract cancer	16	2
Duodenal cancer	2
Gastric cancer	2
Colon cancer	2
Urothelial cancer	1
Liposarcoma	1
Biliary tract stone	4
Cholecystitis	1
Benign biliary stricture		1
Target biliary part (distal/hilar)	41/10	12/1	0.44
Anamnesis	21 (41.2)	7 (53.8)	0.53
Cardiovascular diseases	13 (25.5)	3 (23.1)	1.0
Diabetes mellitus	5 (9.8)	4 (30.8)	0.07
Pulmonary diseases	3 (5.9)	0 (0)	1.0
Renal diseases	0 (0)	1 (7.7)	0.2
Past history of upper gastrointestinal surgery	9 (17.6)	1 (7.7)	0.67
Serum WBC count, (× 103/μL)	6.8 (5.0-8.7)	6.8 (4.9-9.3)	0.92
Serum CRP level, mg/L	3.2 (1.1-6.7)	5.1 (2.4-8.1)	0.33
Serum bilirubin level, mg/dL	4.9 (1.6-11.5)	5.9 (0.3-24.8)	0.97

WBC: White blood cell; CRP: C-reactive protein; PS: Plastic stent; MS: Metallic stent.