Table 2.

Fit indices for measurement invariance tests on the PFUS

Model	N	χ2	df	CFI	ΔCFI	RMSEA	ΔRMSEA
Gender
Boys	712	82.54*	85	1.00	–	0.000	–
Girls	740	104.43*	85	0.994	–	0.018	–
Configural invariance	1,452	186.96*	170	0.997	–	0.012
Metric invariance	1,452	213.44*	184	0.994	0.002	0.015	0.003
Scalar invariance	1,452	238.44*	193	0.991	0.003	0.018	0.003
Age
Adolescents (14–19 years)	713	86.03*	85	0.999	–	0.004	–
Young adults (19–29 years)	739	114.50*	85	0.991	–	0.022	–
Configural invariance	1,452	200.53*	170	0.994	–	0.016	–
Metric invariance	1,452	257.31*	184	0.986	0.008	0.023	0.008
Scalar invariance	1,452	271.46*	193	0.985	0.001	0.024	0.000

^*p < .001.