Brief Article
Copyright ©2011 Baishideng Publishing Group Co.
World J Gastroenterol. Sep 28, 2011; 17(36): 4124-4129
Published online Sep 28, 2011. doi: 10.3748/wjg.v17.i36.4124
Table 2 Characteristics of study population (n = 4412)
Variable groupFrequency (%)
Gender
Male40.1
Female59.9
Age
≥ 40 yr, < 50 yr49.9
≥ 50 yr, < 60 yr33.6
≥ 60 yr17.5
Education level
Elementary school or none17.3
Middle school19.7
High school44.3
University or above18.7
Sedation
Yes48.0
No52.0