Feasibility, reliability and validity of the health-related quality of life instrument Child Health Utility 9D (CHU9D) among school-aged children and adolescents in Sweden

Table 6 Model fit in confirmatory factor analyses testing the CHU9D one-factor structure among school children in grades 1–9 and stratified by school stages (child and adult algorithms) (n = 473)

	RMSEA	CFI	TLI	SRMR
CHU9D (child algorithm)
All	0.05	0.95	0.94	0.04
School stages
Grades 1–3	0.09	0.85	0.80	0.07
Grades 1–3, adjusted¹	0.07	0.89	0.85	0.06
Grades 4–6	0.00	1.00	1.06	0.04
Grades 7–9	0.06	0.94	0.92	0.05
CHU9D (adult algorithm)
All	0.04	0.96	0.95	0.04
School stages
Grades 1–3	0.08	0.82	0.76	0.06
Grades 1–3, adjusted¹	0.07	0.88	0.83	0.06
Grades 4–6	0.00	1.00	1.08	0.04
Grades 7–9	0.03	0.98	0.98	0.05

CFI comparative fit index, RMSEA root mean square error of approximation, SRMR standardized root mean square residual, TLI Tucker–Lewis index
CFI and TLI ≥ 0.90 considered acceptable and ≥ 0.95 excellent model fit
RMSEA ≤ 0.8 considered acceptable and ≤ 0.5 good model fit
SRMR ≤ 0.8 considered acceptable model fit
¹Correlations between dimensions “worried” and “sad” allowed as suggested by the modification indices

ISSN: 1477-7525