Table 4 Confirmatory analyses for á priori hypothesised models of TPSS and SPSI with chi-square (Χ²) and degrees of freedom (df). Model fit evaluated by comparative fit index (CFI), root mean square error of approximation (RMSEA) with 90% confidence interval (CI).

TPSS:

First order model with one latent factor

35.67*

14

0.984

0.066

(0.039–0.093)

SPSI:

First order model with one latent variable

1411.58*

44

0.770

0.294

(0.281–0.308)

First order model with three latent correlated latent factors

186.27*

41

0.976

0.099

(0.085–0.114)

Second order model with one higher order latent factor and three first order latent factors

186.27*

41

0.976

0.099

(0.085–0.114)

Both scales:

TPSS first order model and SPSI first order model with three correlated latent variables

330.58*

129

0.970

0.066

(0.058–0.075)