Table 1. Patient demographics and clinical characteristics.

	Spray group(n = 157)	Combination group(n = 170)
Age, y	65.4 ± 15.5	65.3 ± 12.6
Gender (male:gemale)	84:73	97:73
Height, cm	160.5  ±  9.4	160.8 ± 9.2
Weight, kg	57.5 ± 12.2	59.2 ± 12.4
Body mass index	22.2 ± 3.6	22.7 ± 3.4
ECOG PS(0:1: ≥ 2)	105:43:9	120:39:11
Drinking habit(Never:Sometimes:One or more times per week:Every day)	87:26:17:27	83:34:20:22
Smoking habit: (no:yes)	86:71	101:69
Number of endoscopies(1st time: 2nd to 4th times: 5th times or more)	10:78:69	20:91:59
Sedation ( + :-)	108:49( + : 68.8 %)	115:55( + : 67.6 %)
Antispasmodic ( + :-)	77:80( + : 49.0 %)	94:76( + : 55.3 %)