Table 2.

Diabetes Management Questionnaire scores and psychometrics for children with Type 1 diabetes and their parents, stratified by child age

	All participants	Age <13 years	Age ≥13 years	P *
Children with Type 1 diabetes
Initial score (n = 273), mean sd  (range)	70.6 ± 12.9 (32.5–100.0)	73.7. ± 11.5 (42.5–92.5)	68.0 ± 13.5 (32.5–100.0)	0.0003
Internal consistency, α	0.79	0.70	0.82
Re-test score (n = 255), mean sd  (range)	74.2 ± 13.7 (25.0–98.8)	77.9 ± 11.8 (41.3–98.8)	71.1 ± 14.4 (25.0–98.8)	<0.0001
Intraclass correlation coefficient**	0.65	0.49	0.73
Parents
Initial score (n = 273), mean ± sd  (range)	74.1 ± 13.4 (16.3–98.8)	79.0 ± 10.5 (42.5–98.8)	69.9 ± 14.1 (16.3–96.3)	<0.0001
Internal consistency, α	0.83	0.70	0.84
Re-test score (n = 254), mean ± sd  (range)	75.3 ± 12.9 (31.3–98.7)	80.2 ± 10.4 (52.5–98.7)	70.9 ± 13.2 (31.3–95.0)	<0.0001
Intraclass correlation coefficient**	0.83	0.76	0.85

^*Difference in Diabetes Management Questionnaire (DMQ) scores by child age.

^**Intraclass correlation coefficient=intraclass correlation coefficient between initial DMQ score and re-test DMQ score.