Table 3.

Fit Statistics of the Athens Insomnia Scale (AIS) Scores in Nurses

Models	CFI	IFI	AIC	RMSEA	χ2	df	p	χ2/df
A	0.893	0.894	167.946	0.134 (0.111–0.157)	119.946	20	0.000	5.997
B	0.904	0.905	158.323	0.130 (0.106–0.154)	108.323	19	0.000	5.701
C	0.966	0.966	100.697	0.077 (0.052–0.103)	50.697	19	0.000	2.668
D	0.967	0.967	101.869	0.081 (0.054–0.108)	47.869	17	0.000	2.816

Notes: A: 1-Factor 25, B: 2-Factor model 26,27, C: 2-Factor28 ; D: 3-Factor model20 .

Abbreviations: CFI, comparative fit index; IFI,  Incremental Fit Index; AIC, Akaike information criterion; RMSEA, root mean square error of approximation.