Table4.

Fit indices of first- and second-order confirmatory factor analysis of the QoR-15 questionnaire

CFA	χ2	df	P-value	CMIN/df	RMSEA	PCFI	PNFI	AGFI	IFI	CFI
First-order after structure modification	156.236	81	< 0.001	1.92	.052	.642	.681	.702	.924	.962
Second-order after structure modification	241.793	89	< 0.001	2.71	.062	.631	.573	.628	.903	.952

QoR-15: Quality of recovery; CFA: confirmatory factor analysis; CMIN/DF: Chi-square/degree-of-freedom ratio; RMSEA: Root Mean Square Error of Approximation; PCFI: Parsimonious Comparative Fit Index; PNFI: Parsimonious Normed Fit Index; AGFI: Adjusted Goodness-of-Fit Index; IFI: Incremental Fit Index; CFI: Comparative Fit Index

Fit indices: PNFI, PCFI, AGFI (> 0.5), CFI, IFI (> 0.9), RMSEA (> 0.08), and CMIN/DF (> 3 good, > 5 acceptable)