Table 3.

Goodness-of-fit indexes for all structural models.

Models	χ2	df	B-Sp	SRMR	CFI	RMSEA	90% CI
Model 1 (CS)	198.090	62	<0.001	0.074	0.911	0.073	0.062–0.085
Model 1 (VS)	161.419	62	<0.001	0.066	0.943	0.063	0.051–0.075
U15	136.181	62	<0.001	0.055	0.922	0.077	0.059–0.095
U17	134.859	62	0.002	0.097	0.907	0.076	0.058–0.093
U19	137.240	62	<0.001	0.081	0.920	0.079	0.061–0.096
U21	121.405	62	0.004	0.074	0.919	0.069	0.051–0.088

CS, calibration sample; VS, validation sample; SM, structural models χ², Chi-square; df, degrees of freedom; B–Sp, Bollen–Stine bootstrap level of significance (2000 samples); SRMR, standardized root mean square residual; CFI, comparative fit index; RMSEA, root mean squared error of approximation; 90% CI, confidence interval of RMSEA.