The Pittsburgh Sleep Quality Index: Reliability, Factor Structure, and Related Clinical Factors among Children, Adolescents, and Young Adults with Chronic Pain

Table 3

Indices of fit for initial and final PSQI single-factor models.

Model	(df)		RMSEA	CFI	AIC
Initial model	196.02 (14)	14	0.16	0.77	238.02
Final model	42.03 (12)	3.50	0.07	0.96	88.03

Pittsburgh Sleep Quality Index, chi-squared and degrees of freedom, chi-square and its ratio with degrees of freedom, Root Mean Square Error of Approximation, Comparative Fit Index, and Akaike Information Criterion.