German Beck Scale for Suicide Ideation (BSS): psychometric properties from a representative population survey

BMC Psychiatry

Table 4 Fit indices for the measurement invariance

Model	χ²	df	CFI	RMSEA [95% CI]	Δ_CFI	ΔRMSEA
Group = gender
Configural	40.915	11	0.997	0.047 [0.032, 0.063]	–	–
Weak	48.435	15	0.997	0.043 [0.030, 0.056]	< .001	0.004
Strong	48.776	19	0.997	0.036 [0.024, 0.048]	< .001	0.007
Strict	50.061	23	0.998	0.031 [0.019, 0.043]	0.001	0.005
Group = age
Configural	26.326	17	0.999	0.026 [0.000, 0.044]	–	–
Weak	57.155	25	0.997	0.040 [0.026, 0.053]	0.002	0.014
Strong	59.228	33	0.998	0.031 [0.018, 0.044]	0.001	0.009
Strict	61.958	41	0.998	0.025 [0.010, 0.037]	< .001	0.006
Group = depression status
Configural	42.116	11	0.995	0.048 [0.033,0.064]	–	–
Weak	44.812	15	0.996	0.040 [0.027, 0.054]	0.001	0.008
Strong	53.68	19	0.995	0.039 [0.027, 0.051]	0.001	0.001
Strict	62.533	23	0.994	0.037 [0.026, 0.049]	0.001	0.002

Note. CFI Comparative Fit Index; All fit statistics are robust.; configural = (for identification purposes) loadings of one marker variable per factor fixed to 1, unique variances of marker variables fixed to 1; all thresholds equally constrained across groups, unique variance of first group fixed to 1, factor means of first group fixed to 0; weak/strong = additionally all free loadings constrained to equality across groups; strict = additionally all unique variances of all groups fixed to 1

ISSN: 1471-244X