Table 4.
Factor analysis of 20 MFI item responses.
| Five Factors | |||||
|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | |
| General Fatigue | |||||
| I feel fit | .83 | ||||
| I feel tired | .71 | ||||
| I feel rested | .52 | ||||
| I tired easily | .61 | ||||
| Physical Fatigue | |||||
| Physically I feel I am in an excellent condition | .81 | ||||
| Physically I feel I am in a bad condition | .67 | ||||
| Physically I can take on a lot | .56 | ||||
| Physically I feel only able to do a little | .54 | ||||
| Reduced Activity (Vigor) | |||||
| I think I do very little in a day | .84 | ||||
| I think I do a lot in a day | .78 | ||||
| I get little done | .72 | ||||
| I feel very active | .68 | ||||
| Reduced Motivation | |||||
| I have a lot of plans | .89 | ||||
| I feel like doing all sorts of nice things | .53 | ||||
| I dread having to do things | .64 | ||||
| I don't feel like doing anything | .58 | ||||
| Mental Fatigue (Cognition) | |||||
| When I am doing something, I can keep my thoughts on it | .81 | ||||
| I can concentrate well | .81 | ||||
| My thoughts easily wander | .75 | ||||
| It takes a lot of effort to concentrate on things | .71 | ||||
| Total % of Variance Explained | 20.10 | 15.18 | 14.10 | 13.40 | 6.87 |
Note: Factor loadings less than 0.5 were not listed in the table. The numbers in bold indicated the largest factor loading of the item loaded on different factor components.
Kaiser-Meyer-Olkin (KMO) = 0.938, p-value for Bartlett's Test of Sphericity is < 0.001. Cumulative % of Variance Explained is 70%.