Factor structure and longitudinal measurement invariance of the K6 among a national representative elder sample of China

Table 4 Model goodness-of-fit indices

Model	Year 2010					Year 2014
	χ²	df	CFI	TLI	RMSEA(90%CI)	χ²	df	CFI	TLI	RMSEA(90%CI)
One-factor model(Kessler et al., 2002)	809.394	9	0.970	0.950	0.152(0.143, 0.161)	694.440	9	0.974	0.956	0.141(0.132, 0.150)
Two-factor model(Zhang & Li, 2020)	154.379	8	0.994	0.990	0.069(0.060, 0.079)	149.377	8	0.995	0.990	0.068(0.059, 0.078)
Two-factor model (Lee et al., 2012)	768.246	8	0.971	0.946	0.157(0.148, 0.167)	644.217	8	0.976	0.955	0.144(0.135, 0.153)
Two-factor model(Bessaha, 2015)	625.869	8	0.977	0.956	0.142(0.132, 0.151)	433.816	8	0.984	0.970	0.118(0.108, 0.127)

N = 3845. χ², chi-square goodness of fit statistic; df, degrees of freedom; CFI Comparative fit index, TLI Tucker lewis index, RMSEA Root-mean-square error of approximation

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