Table 4.
Mental Fatigability Bifactor Loadings and I-ECV Values
| Item Content | General Factor | Health Challenges |
Daily Living Challenges |
Concentration Challenges |
Access Challenges |
I-ECV |
|---|---|---|---|---|---|---|
| Sleep problems | 0.434 | 0.467 | 0.463 | |||
| Pain | 0.573 | 0.341 | 0.738 | |||
| Poor posture | 0.493 | 0.721 | 0.319 | |||
| Stress | 0.476 | 0.197 | 0.854 | |||
| Medication side-effects | 0.482 | 0.298 | 0.723 | |||
| Wheelchair transfer to and from bed | 0.759 | 0.041 | 0.997 | |||
| Sitting in a wheelchair for an hour or more | 0.704 | 0.316 | 0.832 | |||
| Wheelchair use around the home | 0.778 | 0.360 | 0.824 | |||
| Spending all day in your wheelchair | 0.832 | 0.319 | 0.872 | |||
| Pressure management (preventing pressure sores) | 0.787 | 0.348 | 0.836 | |||
| Posture management | 0.836 | 0.248 | 0.919 | |||
| Household chores, such as cleaning and tidying | 0.723 | 0.365 | 0.797 | |||
| Preparing and clearing away a meal | 0.683 | 0.364 | 0.779 | |||
| Eating a meal | 0.735 | 0.378 | 0.791 | |||
| Lack of peace and quiet | 0.505 | 0.320 | 0.714 | |||
| Inadequately adapted home | 0.526 | 0.574 | 0.456 | |||
| Inadequate medical care when at home | 0.470 | 0.476 | 0.494 | |||
| Concentrating for an hour or more (such as reading, writing, or holding a conversation) | 0.590 | 0.195 | 0.902 | |||
| Using a computer for an hour or more | 0.737 | 0.530 | 0.659 | |||
| Letter-writing, form filling or paying bills | 0.794 | 0.225 | 0.926 | |||
| Wheelchair use over a smooth surface | 0.567 | 0.589 | 0.481 | |||
| Wheelchair use over an uneven surface | 0.468 | 0.782 | 0.264 | |||
| Wheelchair transfer to and from car | 0.303 | 0.785 | 0.130 | |||
| Traveling in your vehicle for an hour or more | 0.774 | 0.065 | 0.993 | |||
| Using an adapted taxi | 0.723 | 0.254 | 0.890 | |||
| Using a bus | 0.736 | 0.075 | 0.990 | |||
| Using a train | 0.761 | 0.272 | 0.887 | |||
| Going to a doctor's appointment | 0.741 | 0.501 | 0.625 | |||
| Shopping, such as having access and reaching merchandise | 0.871 | 0.142 | 0.974 | |||
| Going out to a restaurant | 0.513 | 0.273 | 0.779 | |||
| Attending an event, such as cinema, theater, or a show | 0.648 | 0.419 | 0.705 | |||
| Visiting friends | 0.761 | 0.448 | 0.743 | |||
| Attending a sporting event | 0.806 | 0.413 | 0.792 | |||
| Taking a day trip away from home | 0.697 | 0.563 | 0.605 | |||
| Taking an overnight trip away from home | 0.702 | 0.424 | 0.733 | |||
| Taking a vacation away from home | 0.502 | 0.615 | 0.400 |
Abbreviations: Mental Fatigue (MF); Item explained common variance (I-ECV)
Items stem was: During the past 4 weeks did you experience each of the following? If so, how much mental fatigue did each cause you?
Answer options: No fatigue (0); Mild fatigue (1); Moderate fatigue (2); Extreme fatigue (4).