Table 4.
MFI-20 models tested via Confirmatory Factor Analysis (CFA) in n = 113 patients three months post-ICU (t2)
| Model | Number of free parameters | Chi-square (df) | p value | CFI | TLI | RMSEA (90% CI) |
|---|---|---|---|---|---|---|
| A: Original 5-Factor Model | 64 | 401.231 (166) | <.001 | .783 | .751 | .112 (.098–.127) |
| B: 1-factor model | 40 | 503.517 (170) | <.001 | .692 | .656 | .132 (.119–.146) |
| C: 2-factor model | 84 | 345.654 (146) | <.001 | .816 | .760 | .110 (.096–.126) |
| D: 3-factor model (PF/ GF/ RA summarized) | 80 | 281.998 (150) | <.001 | .878 | .846 | .089 (.073–.104) |
| Original five factorsa | ||||||
| GF | 8 | 3.041 (2) | .219 | .985 | .956 | .068 (.000–.212) |
| PF | 8 | .353 (2) | .838 | 1.000 | 1.050 | .000 (.000–.107) |
| MF | 8 | 5.491 (2) | .064 | .984 | .951 | .125 (.000–.255) |
| RA | 8 | 3.634 (2) | .163 | .991 | .973 | .085 (.000–.224) |
| RM | 8 | 8.161 (2) | .017 | .769 | .308 | .166 (.060–.291) |
RMSEA Root Mean Squared Error of Approximation, CFI Confirmatory Fit Index, CI Confidence Interval, TLI Tucker-Lewis Index, df degrees of freedom, MFI-20 Multidimensional Fatigue Inventory-20, GF General Fatigue, MF Mental Fatigue, PF Physical Fatigue, RA Reduced Activity, RM Reduced Motivation
aeach factor of the original MFI-20 was analyzed in independent models. In models A, C and D, the mean values of each latent variable were fixed to 0 and variances to 1. The latent fatigue factors were intercorrelated. In models B mean values and variance of the latent factor were not specified