Longitudinal measurement invariance of the Working Alliance Inventory - Short form across coaching sessions

BMC Psychology

Table 3 Fit indices for confirmatory factor analysis at T1 (N = 490) and T2 (N = 490)

CFA models	χ^2a	df	χ²/df	RMSEA [90% CI]	CFI	TLI	SRMR	\(\mathbf{\Delta}\mathbf{\upchi 2}\)
T1
One-factor	389*	54	7.21	0.123 [0.112; 0.135]	0.914**	0.895**	0.053**
Two-factor	237*	53	4.47	0.092[0.080; 0.104]**	0.953**	0.942**	0.045**	107.07*
Three-factor	219*	51	4.29	0.089 [0.077; 0.102]**	0.958**	0.945**	0.043**	17.40*
T2
One-factor	364*	54	6.74	0.118 [0.106; 0.129]	0.916**	0.898**	0.049**
Two-factor	249*	53	4.70	0.094 [0.082; 0.106]**	0.947**	0.934**	0.041**	88.95*
Three-factor	227*	51	4.46	0.091 [0.079; 0.103]**	0.952**	0.938**	0.040**	23.90*

df = degrees of freedom; RMSEA = Robust root mean square error of approximation; CI = confidence interval; CFI = Robust comparative fit index; TLI = Robust Tucker-Lewis index; SRMR = standardized root mean residual
*p < .001; **Meeting threshold criteria: RMSEA/SRMR < .10, CFI/TLI > .90
^aRounded at nearest integer

ISSN: 2050-7283