Graded response model fit, measurement invariance and (comparative) precision of the Dutch-Flemish PROMIS® Upper Extremity V2.0 item bank in patients with upper extremity disorders

Table 3 Results with respect to the IRT-model assumptions of the DF-PROMIS-UE v2.0 bank

Analyses	Outcome	Result
IRT assumptions and model fit
Confirmatory Factor Analysis of one-factor model	Chi square	5964.333
	df	989
	p-value	0.000
	Scaled CFI	0.93
	Scaled TLI	0.93
	Scaled RMSEA (90% CI)	0.099 (0.097–0.101)
	Scaled SRMR	0.09
Exploratory Factor Analysis	Eigenvalue first factor	30.1
	Eigenvalue second factor	2.8
	Ratio	10.7
Exploratory bi-factor analysis	ECV	0.68
Exploratory bi-factor analysis	Omega-H	0.80
Local Dependency	Residual correlation > 0.17	4 item pairs locally dependent (3.3%)
Monotonicity	Scalability coefficient H	0.63
Monotonicity	Scalability coefficients H_i	Range 0.55–0.70

Abbreviations in alphabetic order: CFI Comparative Fit Index, ECV Explained Common Variance, RMSEA Root Means Square Error of Approximation, SRMR Standardized root mean residual, TLI Tucker-Lewis Index

ISSN: 1471-2474