Table 5.
Physical Fatigue Item Response Theory Parameters
| Scale | Item Content | Slope | Threshold 1 | Threshold 2 | Threshold 3 |
|---|---|---|---|---|---|
| Health Challenges | |||||
| PF Hlth1 | Sleep problems | 1.07 | −2.83 | −0.31 | 1.43 |
| PF Hlth2 | Pain | 1.27 | −2.47 | −0.46 | 0.8 |
| PF Hlth3 | Indigestion problems | 0.89 | −1.98 | 1.56 | 2.94 |
| PF Hlth4 | Dehydration problems | 0.54 | −2.01 | 1.94 | 2.56 |
| PF Hlth6 | Spasticity | 0.99 | −1.60 | 0.48 | 2.34 |
| PF Hlth7 | Stress | 1.13 | −2.01 | 0.27 | 1.71 |
| PF Hlth8 | Medication side-effects | 0.82 | −2.77 | 0.85 | 2.84 |
| Daily Living Challenges | |||||
| PF Home1 | Wheelchair transfer to and from bed | 1.02 | −1.27 | 1.13 | 3.02 |
| PF Home5 | Wheelchair use around the home | 1.68 | −0.32 | 1.17 | 2.44 |
| PF Home9 | Household chores, such as cleaning and tidying | 1.70 | −1.94 | 0.38 | 1.53 |
| PF Home10 | Preparing and clearing away a meal | 2.13 | −1.14 | 0.73 | 2.01 |
| PF Home11 | Eating a meal | 1.50 | 0.62 | 2.03 | 3.98 |
| PF Envr1 | Lack of peace and quiet | 0.77 | −1.94 | 2.29 | 3.88 |
| PF Envr2 | Inadequately adapted home | 1.00 | −2.04 | 1.15 | 2.43 |
| PF Envr3 | Inadequate medical care when at home | 1.04 | −1.46 | 2.15 | 3.61 |
| PF Envr4 | Inadequate non-medical care when at home | 0.95 | −2.08 | 2.03 | 2.89 |
| PF Home3 | Concentrating for an hour or more (such as reading, writing, or holding a conversation) | 1.51 | −0.64 | 0.68 | 2.28 |
| PF Home4 | Using a computer for an hour or more | 1.15 | −1.02 | 0.63 | 3.06 |
| PF Home12 | Letter-writing, form filling or paying bills | 1.13 | −0.53 | 2.36 | 3.41 |
| Seating Challenges | |||||
| PF Home2 | Sitting in a wheelchair for an hour or more | 1.68 | −0.81 | 0.69 | 2.21 |
| PF_Hlth5 | Poor posture | 0.55 | −2.25 | 1.73 | 3.09 |
| PF Home6 | Spending all day in your wheelchair | 1.24 | −2.27 | −0.47 | 1.07 |
| PF Home7 | Pressure management (preventing pressure sores) | 0.91 | −0.53 | 2.22 | 3.44 |
| PF Home8 | Posture management | 1.10 | −1.03 | 1.50 | 3.16 |
| Access Challenges | |||||
| PF Away1 | Wheelchair use over a smooth surface | 1.35 | −0.08 | 1.66 | 3.18 |
| PF Away2 | Wheelchair use over an uneven surface | 1.36 | −1.57 | 0.04 | 1.28 |
| PF Away3 | Wheelchair transfer to and from car | 1.56 | −1.11 | 0.92 | 1.97 |
| PF Away4 | Traveling in your vehicle for an hour or more | 1.42 | −1.35 | 0.38 | 1.85 |
| PF Away5 | Using an adapted taxi | 2.26 | −2.94 | 1.83 | 2.45 |
| PF Away6 | Using a bus | 1.96 | −2.69 | 2.23 | 2.69 |
| PF Away7 | Using a train | 2.39 | −2.71 | 2.03 | 2.47 |
| PF Away9 | Going to a doctor's appointment | 1.15 | −1.61 | 1.28 | 3.06 |
| PF Away10 | Shopping, such as having access and reaching merchandise | 1.69 | −1.01 | 0.56 | 1.77 |
| PF Away12 | Attending an event, such as cinema, theater, or a show | 2.05 | −1.12 | 0.99 | 2.28 |
| PF Away13 | Visiting friends | 2.03 | −1.16 | 1.09 | 1.82 |
| PF Away14 | Attending a sporting event | 1.71 | −1.81 | 1.40 | 2.25 |
| PF Away15 | Taking a day trip away from home | 2.11 | −1.75 | 0.48 | 1.45 |
| PF Away16 | Taking an overnight trip away from home | 1.86 | −2.48 | 0.17 | 1.15 |
| PF Away17 | Taking a vacation away from home | 1.17 | −3.13 | 0.88 | 2.85 |
Abbreviations: Physical Fatigue (PF).
Items stem was: During the past 4 weeks did you experience each of the following? If so, how much physical fatigue did each cause you?