Table 4. Internal consistency of the Vietnamese version of DDS (n = 31)

Subscales	Items	Mean (SD)	Item – total correlation	Cronbach’s alpha
Emotional burden (EB)	1	2.09 (1.58)	0.90	0.90
	4	1.45 (0.92)	0.68
	7	2.35 (1.58)	0.80
	10	2.06 (1.48)	0.92
	14	1.96 (1.58)	0.91
Physician disticss (PD)	2	1.39 (0.92)	0.91	0.76
	5	1.32 (0.75)	0.75
	11	1.16 (0.37)	0.50
	15	1.58 (1.20)	0.87
Regimen distress (RD)	3	1.90 (1.44)	0.77	0.91
	6	2.03 (1.38)	0.86
	8	1.77 (1.23)	0.79
	12	2.16(1.32)	0.94
	16	1.58 (1.26)	0.93
Interpersonal distress (ID)	9	1.29 (0.90)	0.96	0.93
	13	1.42 (0.96)	0.89
	17	1.26 (0.96)	0.96
Total DDS				0.94