Psychometric evaluation of the depression, anxiety, and stress scale-21 (DASS-21) among Chinese primary and middle school teachers

Table 2 Results of CFA Model Fit

	χ² (df)	CFI	NNFI	RMSEA (90% Confidence Interval)	SRMR	AIC
One-factor structure
Cross-sectional survey	4336.87 (189)	0.996	0.996	0.049 (0.048–0.051)	0.029	4420.87
Longitudinal survey Wave 1	1422.98 (189)	0.992	0.991	0.063 (0.060–0.066)	0.045	1506.98
Longitudinal survey Wave 2	1290.92 (189)	0.994	0.993	0.060 (0.057–0.063)	0.039	1374.92
Two-factor structure
Cross-sectional survey	4339.81 (188)	0.996	0.996	0.049 (0.048–0.051)	0.029	4425.81
Longitudinal survey Wave 1	1430.97 (188)	0.992	0.991	0.063 (0.060–0.067)	0.044	1516.97
Longitudinal survey Wave 2	1270.55 (188)	0.994	0.993	0.059 (0.056–0.062)	0.039	1356.55
Three-factor structure
Cross-sectional survey	4288.06 (186)	0.996	0.996	0.049 (0.048–0.051)	0.029	4378.06
Longitudinal survey Wave 1	1373.08 (186)	0.992	0.991	0.062 (0.059–0.066)	0.044	1463.08
Longitudinal survey Wave 2	1226.00 (186)	0.994	0.994	0.058 (0.055–0.062)	0.038	1315.99

CFI = comparative fit index; NNFI = non-normed fit index; RMSEA = root mean square error of approximation; SRMR = standardized root mean square residual

ISSN: 2050-7283