Table 1. Summary of measurement invariance test of the POMS models.

Model	DF	χ2	Δ χ2	Δ DF	Δ χ2 P	CFI	TLI	RMSEA
POMS Positive Factors (“Friendly”, “Active” and “Clear Headed”)
Configural model	879	1990.5				0.994	0.993	0.078
Metric Invariance	908	2043.9	10.5	29	0.9993	0.994	0.994	0.078
Scalar Invariance	1024	2229.3	397.1	116	<2.2E-16	0.994	0.994	0.076
POMS Negative Factors (“On Edge” and “Fatigued”)
Configural model	218	242.9				0.999	0.999	0.024
Metric Invariance	236	297.8	32.2	18	0.0208	0.997	0.997	0.036
Scalar Invariance	288	577.6	444.5	52	<2.2E-16	0.988	0.988	0.070

CFI: comparative fit index.