TABLE 1.

Fit statistics for the measurement models.

Models	χ2 (df)	χ2/df	CFI	TLI	RMSEA (90% CI)	SRMR	Model comparison	Δχ2 (df)	Δ CFI	Δ TLI	Δ RMSEA
Study 1
M1: 2 latent factors	66.80* (34)	1.965	0.922	0.897	0.090 (0.057–0.121)	0.065
M2: 1 latent factor	120.97** (35)	3.456	0.795	0.737	0.143 (0.116–0.171)	0.100	M1	54.17** (1)	0.127	0.160	0.053
Study 2
M1: 2 latent factors	88.30** (34)	2.597	0.954	0.939	0.088 (0.065–0.110)	0.060
M2: 1 latent factor	339.82** (35)	9.709	0.742	0.668	0.205 (0.185–0.225)	0.119	M1	251.52** (1)	0.212	0.271	0.117
Study 3
M1: 2 latent factors	69.28* (34)	2.038	0.951	0.935	0.084 (0.055–0.112)	0.051
M2: 1 latent factor	176.92** (35)	5.055	0.801	0.745	0.166 (0.142–0.190)	0.104	M1	107.64** (1)	0.150	0.190	0.082
Combined samplea
M1: 2 latent factors	93.00** (34)	2.735	0.975	0.966	0.060 (0.046–0.075)	0.042
M2: 1 latent factor	504.72** (35)	14.420	0.797	0.740	0.168 (0.155–0.181)	0.106	M1	411.72** (1)	0.178	0.226	0.108

*p < 0.05

**p < 0.001.

^aThis consists of the samples of Study 1, Study 2 (time 1), and Study 3.