Table. 1. Table 1

Level of quality among each study

Evidence level	Definition	Frequency N (%)
I	Systematic reviews	0 (0.0)
	Meta-analyses
	Randomized controlled trials
II	Two groups non-randomized studies	0 (0.0)
III	One group non-randomized studies	1 (14.3)
IV	Single subject designs	0 (0.0)
	Surveys
V	Case reports	6 (85.7)
	Narrative literature reviews
	Qualitative researches
	Total	7 (100.0)

J Korean Dysphagia Soc 2022;12:96~104 https://doi.org/10.34160/jkds.2022.12.2.003

© J. Korean Dysphagia Soc.