Table 3. CFA Fit Indices for the Five Models Tested Pre- and Post-MBCT for Both Long (FFMQ-39) and Short (FFMQ-15) Versions of the FFMQ and the Configural Invariance Models.

Model	CFI	RMSEA [90% CI]	NNFI	SRMR	χ2	df	AIC
Note. Indices in boldface fall within the acceptable range when rounded up or down to two decimal places. AIC = Akaike information criterion; CFI = comparative fit index; CI = confidence interval; FFMQ = Five Facet Mindfulness Questionnaire; MBCT = mindfulness-based cognitive therapy; NNFI = non-normed fit index; RMSEA = root mean square error of approximation; SRMR = standardized root mean square residual.
a Four-factor hierarchical refers to the model in which the facets acting with awareness, nonjudging, and nonreactivity (without the observing facet) were loaded onto an overall mindfulness factor. b Five-factor hierarchical refers to the model in which all five facets were loaded onto an overall mindfulness factor. c Configural invariance refers to the model in which pre- and post-MBCT five-factor hierarchical models were tested simultaneously. One model was tested for the FFMQ-39 and one for the FFMQ-15.
* p < .001.
FFMQ-39 pre-MBCT
One-factor	.455	.225 [.213, .236]	.364	.168	1,167.386	90	1,227.386
Four-factor	.950	.086 [.069, .103]	.931	.052	131.792	48	191.792
Four-factor hierarchicala	.939	.092 [.076, .110]	.920	.071	151.358	50	207.358
Five-factor	.951	.071 [.057, .085]	.936	.050	175.948	80	255.948
Five-factor hierarchicalb	.932	.082 [.069, .095]	.916	.085	219.807	85	289.807
FFMQ-39 post-MBCT
One-factor	.508	.230 [.219, .242]	.426	.142	1,222.433	90	1,282.433
Four-factor	.987	.047 [.023, .068]	.982	.037	72.908	48	132.908
Four-factor hierarchical	.986	.047 [.024, .068]	.981	.042	76.453	50	132.453
Five-factor	.987	.040 [.018, .057]	.983	.037	110.068	80	190.068
Five-factor hierarchical	.969	.060 [.045, .074]	.961	.068	157.012	85	227.012
FFMQ-15 pre-MBCT
One-factor	.458	.157 [.145, .169]	.367	.127	613.755	90	673.755
Four-factor	.932	.070 [.052, .089]	.906	.076	103.992	48	163.992
Four-factor hierarchical	.915	.077 [.059, .094]	.888	.084	119.699	50	175.699
Five-factor	.925	.062 [.047, .077]	.902	.071	152.158	80	232.158
Five-factor hierarchical	.895	.071 [.057, .085]	.870	.089	186.794	85	256.794
FFMQ-15 post-MBCT
One-factor	.553	.159 [.147, .171]	.478	.118	627.361	90	687.361
Four-factor	.956	.062 [.042, .081]	.940	.058	91.676	48	151.676
Four-factor hierarchical	.956	.061 [.042, .080]	.942	.060	94.213	50	150.213
Five-factor	.947	.058 [.042, .073]	.930	.055	143.624	80	223.624
Five-factor hierarchical	.926	.067 [.052, .081]	.908	.069	174.442	85	244.442
FFMQ-39 configural invariancec	.886	.079 [.073, .085]	.869	.104	941.057	379	1,113.057
FFMQ-15 configural invariance	.825	.073 [.066, .079]	.800	.096	852.401	379	1,024.401