BMC Pediatrics

Table 3 Internal consistency of the PedsQL^TM3.0DMDfv Dimensions: Cronbach’s alpha

From: Confirmatory validation of the french version of the Duchenne Muscular Dystrophy module of the pediatric quality of life inventory (PedsQL^TM3.0DMDfv)

Dimension	Child (self-assessments)			Proxy-assessments
	Total	Group 8–11 yrs	Group 12–18 yrs	Total	Group 4–7 yrs	Group 8–11 yrs	Group 12–18 yrs
	(n = 89)	(n = 51)	(n = 38)	(n = 99)	(n = 16)	(n = 51)	(n = 32)
Daily Activities
Pearson	0.74	0.72	0.70	0.81	0.86	0.75	0.66
Polyc. + corr.cont	0.78	0.73	0.69	0.82	0.68	0.69	0.74
Treatment
Pearson	0.43	0.41	0.51	0.68	0.79	0.53	0.76
Polyc. + corr.cont	0.50	0.51	0.44	0.70	0.69	0.52	0.70
Worry
Pearson	0.52	0.58	0.43	0.83	0.87	0.84	0.76
Polyc. + corr.cont	0.72	0.77	0.68	0.85	†	0.83	0.64
Communication
Pearson	0.66	0.60	0.68	0.87	0.85	0.85	0.90
Polyc. + corr.cont	0.69	0.56	0.66	0.89	0.75	0.84	0.81

Pearson: Cronbach alpha coefficient based on the Pearson correlation matrix
Polyc. + corr.cont: Cronbach alpha coefficient based on the polychoric correction matrix with correction for empty cells
† Not estimated, because one item had an empty category for the subgroup

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