Table 4.

The psychometric properties of the Diabetes Distress Scale

		Test (n = 114)					Retest (n = 79)
Subscales	Item no.	Cronbach’s α (n = 114)	Corrected item-total correlation	Cronbach’s α if item deleted	Median	IQR	Median	IQR	Intraclass correlation coefficient*
Emotional Burden	2	0.86	0.68	0.83	2.00	2.00	2.00	2.00	0.52
	4		0.76	0.81	2.00	1.00	1.00	2.00	0.61
	7		0.60	0.86	2.00	1.00	2.00	2.00	0.59
	10		0.62	0.84	2.00	2.00	2.00	2.00	0.62
	14		0.74	0.82	2.00	1.00	2.00	2.00	0.56
Physician Distress	1	0.78	0.62	0.71	1.00	1.00	1.00	1.00	0.44
	5		0.70	0.67	1.00	1.00	1.00	1.00	0.64
	11		0.59	0.73	1.00	1.00	1.00	1.00	0.52
	15		0.46	0.80	1.00	1.00	2.00	2.00	0.64
Regime Distress	3	0.84	0.54	0.83	2.00	1.00	2.00	2.00	0.49
	6		0.61	0.81	2.00	2.00	2.00	2.00	0.55
	8		0.75	0.77	2.00	2.00	2.00	2.00	0.57
	12		0.57	0.82	2.00	1.00	2.00	1.00	0.54
	16		0.73	0.78	2.00	2.00	2.00	2.00	0.48
Interpersonal Distress	9	0.81	0.67	0.72	1.00	1.00	1.00	1.00	0.38
	13		0.57	0.83	1.00	1.00	1.00	2.00	0.55
	17		0.73	0.64	1.00	1.00	1.00	1.00	0.44

IQR = interquartile range; *p < 0.001