Evaluation of three patient reported outcome measures following operative fixation of closed ankle fractures

Table 3 Confirmatory factor analysis tests and goodness of fit indices (n = 567)

Instrument	χ2	df	CFI^a	TLI^b	RMSEA^c
LEFS unidimensional	843.4	171	0.99	0.99	0.091
LEFS bidimensional^d	604.4	169	1.00	1.00	0.073
SEFAS	165.9	54	0.99	0.99	0.063
OMAS	122.8	27	0.99	0.98	0.087

All χ2 tests of model fit were significant with the exception of the LEFS (p < 0.01)
^aComparative fit index
^bTucker-Lewis Index
^cRoot mean square error of approximation
^dLEFS bi-dimensional easy (1,3–5,7,8,10,11,13,15,20) and difficult (2,6,9,12,14,16–19) items

ISSN: 1471-2474