Table 3. Free parameters and Fit indices MI analyses total Internet and Paper sample.

MI Analysis	Nr. of Free Parameters	χ2 (df)	RMSEA	CFI	TLI	χ2 difftesta
Configural model	238 free parameters;	17999.62 (556) **	0.05	0.81	0.94
Group 1 paper	42 factor loadings
	72 thresholds
	2 residual correlations
	3 factor covariances
Group 2 Internet	42 factor loadings
	72 thresholds
	2 residual correlations
	3 factor covariances
Metric invariance	197 free parameters;	15462.1 (502) **	0.05	0.84	0.94	152.75 (23) **
Group 1 paper	42 factor loadings
	72 thresholds
	2 residual correlations
	3 factor covariances
Group 2 Internet	27 thresholds
	6 factor (co)variances
	3 factor means
	42 residual variances
Strong invariance	170 free parameters;	15801.84 (503) **	0.05	0.83	0.94	1299.87 (23) **
Group 1 paper	42 factor loadings
	72 thresholds
	2 residual correlations
	3 factor covariances
Group 2 Internet	6 factor (co)variances
	3 factor means
	42 residual variances
Strict invariance	128 free parameters;	10998.13 (386) **	0.05	0.88	0.95	131.1 (34) **
Group 1 paper	42 factor loadings
	72 thresholds
	2 residual correlations
	3 factor covariances
Group 2 Internet	6 factor (co)variances
	3 factor means

Note: MI = Measurement Invariance. df = degrees of freedom.

Metric invariance; model fit compared to fit configural model. Strong invariance; model fit compared to fit Metric invariance model. Strict invariance; model fit compared to fit Strong invariance model.

^a χ² difftest was conducted in Mplus by use of WLSMV estimator.

^** p<0.001.