Influence of night duty on endoscopic therapy for bile duct stones

Table 2 Comparison of patient characteristics

	ND Group	DD Group	P value
	(n = 34)	(n = 99)
Age (yr), mean ± SD	73.1 ± 13.0	72.4 ± 14.3	0.801
Gender (M/W)	21/13	59/40	0.824
History of abdominal surgery, n (%)	7 (20.6)	18 (18.2)	0.757
Double tract reconstruction, n		1
Billroth I		3
Billroth II	4	6
Roux-en-Y	3	7
Duodenoduodenostomy		1
Transverse diameter of the largest stone (mm), mean ± SD	10.6 ± 4.6	10.3 ± 4.9	0.735
Number of stones, mean ± SD	2.8 ± 4.0	2.8 ± 3.6	1.0

ND: Night duty; DD: Day duty; Double tract reconstruction: Double tract reconstruction for proximal gastrectomy; Duodenoduodenostomy: Duodenoduodenostomy for annular pancreas.