Prospective Study
Copyright ©2014 Baishideng Publishing Group Inc.
World J Gastroenterol. Dec 28, 2014; 20(48): 18445-18451
Published online Dec 28, 2014. doi: 10.3748/wjg.v20.i48.18445
Table 1 χ2 test
High-volumeMid-volumeLow-volumeTotal
HV vs MV vs LV1
No ReOP3726117180
ReOP56 (31.5)41 (23)81 (45.5)178
Total93 (60)67 (61)198 (41)358
High + medium vs low2
No ReOP63-117180
ReOP97 (54.5)-81 (45.5)178
Total160 (61)-198 (41)358
HV vs MV vs LV3
No ReOP6111734
ReOP14 (70)4 (26)7 (29)25
Total20152459