Table 5.

Psychometric Properties of the ABCC Scale for People With T2D (n = 60)

Convergent validity, ADDQoL19, r
ABCC domains	ADDQoL19 domains	r
ABCC total	Average WI	−0.548
Feelings and emotions	Self-confidence	−0.260
Feelings and emotions	Feelings about the future	−0.379^{^a}
Physical limitations	Physical	−0.391^{^a}
Physical limitations	Depend on others	−0.459^{^a}
Relations and work	Leisure	−0.441^{^a}
	Work	−0.664^{^a}
	Family life	−0.413^{^a}
	Friendships and social life	−0.448^{^a}
Sexuality	Sex life	−0.650^{^a}
Eating and drinking	Freedom to eat	−0.346^{^a}
Eating and drinking	Freedom to drink	−0.167

Known group validity, median (IQR)
	Insulin independent (n = 32)	Insulin dependent (n = 27)	P value
ABCC total	1.1 (0.7-1.5)	1.9 (1.4-2.7)	.001^{^a}
Feelings and emotions	1.0 (0.5-1.9)	1.5 (1.0-3.0)	.025^{^a}
Physical limitations	1.0 (0.3-1.7)	2.7 (1.3-3.0)	.004^{^a}
Relations and work	0.0 (0.0-1.0)	2.0 (0.0-3.0)	.005^{^a}
Hypoglycaemia	1.0 (0.0-1.8)	2.0 (0.0-2.0)	.038^{^a}
Worry about future	1.0 (0.0-2.0)	2.0 (1.0-3.0)	.051
	No complications (n = 12)	≥1 complications (n = 48)	P value
ABCC total	0.9 (0.4-1.3)	1.7 (1.1-2.6)	.001^{^a}
Feelings/emotions	0.5 (0.0-1.0)	1.3 (1.0-2.5)	.001^{^a}
Physical limitations	0.5 (0.0-1.5)	1.7 (1.0-3.0)	.007^{^a}
Relations and work	0.0 (0.0-1.0)	1.0 (0.0-2.0)	.031^{^a}
	BMI <30 (n = 44)	BMI ≥30 (n = 16)	P value
ABCC total	1.2 (0.8-2.1)	1.9 (1.5-2.8)	.008^{^a}
Feelings and emotions	1.0 (0.5-1.9)	1.8 (1.0-2.5)	.003^{^a}
Physical limitations	1.2 (0.3-2.6)	2.9 (1.4-3.6)	.003^{^a}
Relations and work	0.0 (0.0-2.0)	2.0 (1.0-2.0)	.018^{^a}
Eating and drinking	2.0 (1.0-2.8)	1.5 (1.0-3.8)	.830

Reliability measures
Internal consistency, Cronbach’s α (95% CI)
Total scale	0.91 (0.87-0.94)
Physical limitations	0.87 (0.80-0.92)
Feelings and emotions	0.76 (0.60-0.85)
Test-retest reliability, ICC (95% CI)
0.95 (0.91-0.97)

ABCC = Assessment of Burden of Chronic Conditions; ADDQoL19 = 19-Item Audit for Diabetes-Dependent Quality of Life; BMI = body mass index; ICC = intraclass coefficient; IQR = interquartile range; r = Pearson correlation coefficient; WI = weighted impact.
↵a r < −0.7 for total scales or −0.7 < r < −0.3 for single item-correlations.