Table 2.

Measurement invariance by data collection site.

	Model fit indicators			DIFFTEST
Measurement invariance model	RMSEA (90% C.I.)	CFI	WRMR	χ2	df	p
Configural	0.042 (0.038, 0.047)	0.958	1.54	–	–	–
Metric	0.038 (0.034, 0.043)	0.963	1.67	36.3	20	0.014
Scalar A	0.037 (0.032, 0.041)	0.961	1.76	94.2	62	0.005
Scalar, partial B	0.036 (0.032, 0.040)	0.963	1.74	78.1	61	0.069
Residual free	0.035 (0.031, 0.040)	0.965	1.64	–	–	–
Residual fixed A	0.036 (0.032, 0.040)	0.963	1.74	49.2	21	<0.001
Residual fixed, partial B	0.035 (0.031, 0.040)	0.964	1.73	44.9	20	0.001
Residual fixed, partial C	0.035 (0.031, 0.039)	0.965	1.71	34.9	19	0.015