Retrospective Cohort Study
Copyright ©The Author(s) 2016.
World J Gastroenterol. Mar 14, 2016; 22(10): 2993-3005
Published online Mar 14, 2016. doi: 10.3748/wjg.v22.i10.2993
Table 3 Number of patients followed up for 1-10 years
Follow-up (yr)No. of patientsCumulative frequency1
182316 (100)
353234 (74.1)
545181 (57.3)
765136 (43.0)
107171 (22.5)