Table 1.

Fit Indices for the Analyses Testing Sex Invariance for the PS-ECDI and EDS

	X  2	df	CFI	|ΔCFI|	RMSEA	|ΔRMSEA|	SRMR
PS-ECDI
Configural invariance	2075.140	54	0.516		0.253		0.120
Metric invariance	2089.820	63	0.515	0.001	0.235	0.018	0.127
Scalar invariance	2138.335	72	0.505	0.010	0.222	0.013	0.127
EDS
Configural invariance	28.641	4	0.986		0.103		0.019
Metric invariance	29.934	8	0.988	0.002	0.068	0.035	0.025
Scalar invariance	40.875	12	0.984	0.004	0.064	0.004	0.026

EDS = E-Cigarette Dependence Scale; PS-ECDI = Penn State Electronic Cigarette Dependence Index.