Assessment of participant satisfaction with upper gastrointestinal endoscopy in South Korea

Table 2 Characteristics of study population (n = 4412)

Variable group	Frequency (%)
Gender
Male	40.1
Female	59.9
Age
≥ 40 yr, < 50 yr	49.9
≥ 50 yr, < 60 yr	33.6
≥ 60 yr	17.5
Education level
Elementary school or none	17.3
Middle school	19.7
High school	44.3
University or above	18.7
Sedation
Yes	48.0
No	52.0