The Chinese version of the Perceived Stress Questionnaire: development and validation amongst medical students and workers

Table 4 Measurement Invariance of the C-PSQ across Subgroups

Two-factor	NC	TLI	CFI	RMSEA	Δχ²	ΔDF	ΔTLI	ΔCFI	ΔRMSEA
M1:Configural invariance	799.864/128	0.929	0.942	0.061 [0.057, 0.065]
M2:Metric invariance	855.073/141	0.931	0.938	0.060 [0.056, 0.064]	55.209	13	0.002	0.004	−0.001
M3:Scalar invariance	1023.508/152	0.922	0.924	0.064 [0.060, 0.068]	168.435	11	−0.009	− 0.014	0.004
M4:Strict invariance	1109.198/165	0.922	0.918	0.064 [0.060, 0.068]	85.690	13	0.000	−0.006	0.000
Cutoff value	< 2— < 3	> 0.90	> 0.90	< 0.05 or < 0.08	N/A	N/A	≤0.010	≤0.005 or ≤ 0.010	≤ 0.015

Abbreviation: NC normed chi-square, CMIN/DF; TLI Tucker-Lewis index; CFI comparative fit index; RMSEA root mean square error of approximation; DF degrees of freedom; Δ a change in (χ², DF, TLI, CFI, RMSEA); N/A not applicable

ISSN: 1477-7525