Table 1.

Distribution of upper gastrointestinal anatomical positional classifications of still image datasets obtained from EGDs.

Data Categorization Criteria	Number of Image Data (%)
	Primary Classification	Secondary Classification
Esophagus	6910 (22.0)	4707 (68.1)
Gastroesophageal junction		2203 (31.8)
Cardia	2126 (6.7)
Upper body	8815 (28.0)	3046 (34.5)
Middle body		3521 (39.9)
Lower body		2248 (25.5)
Angle	2226 (7.0)
Antrum	4161 (13.2)
Duodenal bulb	2631 (8.3)	1036 (39.3)
Duodenum second portion		1595 (60.6)
Non-clear	4534 (14.4)
Total	31,403 (100.0)