Table 5.

Reliability of the QOLIBRI: Comparison of the CENTER-TBI results with the values from the original English validation study in the field of TBI.

QOLIBRI	Scale	CENTER-TBI 1									Original English Version 2
		Dutch	English	Finnish	French	German	Italian	Norwegian	Spanish	Swedish	TBI
N	-	583	224	207	104	77	271	247	255	57	97
Cronbach’s alpha	Cognition	0.92	0.92	0.92	0.93	0.91	0.93	0.93	0.92	0.92	0.92
	Self	0.92	0.92	0.94	0.94	0.92	0.94	0.93	0.93	0.92	0.90
	Daily life	0.93	0.93	0.92	0.93	0.93	0.94	0.90	0.94	0.92	0.93
	Social	0.86	0.88	0.85	0.89	0.87	0.88	0.84	0.84	0.76	0.88
	Emotions	0.87	0.85	0.82	0.89	0.86	0.86	0.85	0.86	0.86	0.88
	Physical	0.79	0.79	0.79	0.81	0.76	0.85	0.82	0.84	0.75	0.80
	Total	0.96	0.96	0.96	0.97	0.96	0.97	0.96	0.96	0.95	0.97
N	-	583	224	207	104	77	271	247	255	57	56
Split-half or test–retest reliability 3	Cognition	0.90	0.91	0.93	0.94	0.92	0.94	0.92	0.91	0.92	0.80
	Self	0.93	0.94	0.96	0.95	0.92	0.95	0.94	0.94	0.93	0.83
	Daily life	0.95	0.95	0.94	0.94	0.95	0.94	0.92	0.95	0.96	0.77
	Social	0.88	0.91	0.86	0.95	0.90	0.89	0.86	0.89	0.86	0.79
	Emotions	0.89	0.86	0.87	0.90	0.89	0.88	0.88	0.89	0.88	0.76
	Physical	0.78	0.76	0.78	0.80	0.83	0.88	0.83	0.86	0.77	0.83
	Total	0.97	0.98	0.98	0.98	0.98	0.98	0.98	0.97	0.98	0.88

Note. ¹ Reliability coefficients (CENTER-TBI study sample). ² Reliability coefficients (original English validation of the QOLIBRI in a TBI sample [32]). ³ Split-half reliability (CENTER-TBI data), test–retest reliability (original study); N = number of cases; values in bold represent at least satisfactory reliability (≥0.70).