Table 4. Face validity of the Vietnamese version of the UTBAS-6 scale (n=10)

	Relevance		Clarity
	Number of raters	%	Number of raters	%
Level 1	0	0	0	0
Level 2	0	0	0	0
Level 3	1	10	4	40
Level 4	5	50	4	40
Level 5	4	40	2	20