Table 6.
Mental Fatigue Item Response Theory Parameters
| ItemID | Item Content | Slope | Threshold 1 | Threshold 2 | Threshold 3 |
|---|---|---|---|---|---|
| Health Challenges | |||||
| MF Hlth1 | Sleep problems | 0.86 | −3.24 | −0.11 | 1.57 |
| MF Hlth2 | Pain | 0.89 | −3.34 | −0.22 | 1.34 |
| MF Hlth5 | Poor posture | 0.38 | −3.75 | 2.12 | 3.47 |
| MF Hlth7 | Stress | 1.01 | −2.34 | −0.28 | 1.52 |
| MF Hlth8 | Medication side-effects | 0.48 | −3.35 | 1.71 | 3.81 |
| Daily Living Challenges | |||||
| MF Home1 | Wheelchair transfer to and from bed | 1.52 | −0.32 | 1.29 | 2.45 |
| MF Home2 | Sitting in a wheelchair for an hour or more | 1.65 | −0.25 | 1.31 | 1.93 |
| MF Home5 | Wheelchair use around the home | 2.07 | −0.01 | 1.08 | 1.94 |
| MF Home6 | Spending all day in your wheelchair | 1.35 | −1.19 | 0.61 | 1.57 |
| MF Home7 | Pressure management (preventing pressure sores) | 1.32 | −0.41 | 1.92 | 3.32 |
| MF Home8 | Posture management | 1.53 | −0.19 | 1.56 | 2.81 |
| MF Home9 | Household chores, such as cleaning and tidying | 2.22 | −0.78 | 0.72 | 1.67 |
| MF Home10 | Preparing and clearing away a meal | 2.25 | −0.41 | 0.94 | 1.99 |
| MF Home11 | Eating a meal | 2.53 | 0.52 | 1.77 | 2.71 |
| MF Envr1 | Lack of peace and quiet | 0.42 | −2.72 | 2.56 | 3.74 |
| MF Envr2 | Inadequately adapted home | 0.85 | −2.06 | 1.42 | 2.63 |
| MF Envr3 | Inadequate medical care when at home | 0.62 | −1.95 | 2.48 | 3.81 |
| Concentration Challenges | |||||
| MF Home3 | Concentrating for an hour or more (such as reading, writing, or holding a conversation) | 1.85 | −0.70 | 0.57 | 1.93 |
| MF Home4 | Using a computer for an hour or more | 1.62 | −0.46 | 0.66 | 2.66 |
| MF Home12 | Letter-writing, form filling or paying bills | 1.24 | −0.44 | 1.51 | 2.81 |
| Access Challenges | |||||
| MF Away1 | Wheelchair use over a smooth surface | 1.70 | 0.72 | 1.95 | 3.92 |
| MF Away2 | Wheelchair use over an uneven surface | 2.02 | −0.44 | 0.86 | 1.95 |
| MF Away3 | Wheelchair transfer to and from car | 1.78 | −0.66 | 1.32 | 1.96 |
| MF Away4 | Traveling in your vehicle for an hour or more | 2.44 | −0.56 | 0.68 | 1.53 |
| MF Away5 | Using an adapted taxi | 1.49 | −2.47 | 2.60 | 3.01 |
| MF Away6 | Using a bus | 2.11 | −2.46 | 2.40 | 2.61 |
| MF Away7 | Using a train | 2.66 | −2.85 | 2.17 | 2.40 |
| MF Away9 | Going to a doctor's appointment | 1.87 | −1.01 | 1.16 | 2.07 |
| MF Away10 | Shopping, such as having access and reaching merchandise | 3.10 | −0.54 | 0.60 | 1.41 |
| MFAway11 | Going out to a restaurant | 3.36 | −0.12 | 1.16 | 1.61 |
| MF Away12 | Attending an event, such as cinema, theater, or a show | 2.51 | −0.69 | 1.14 | 1.59 |
| MF Away13 | Visiting friends | 2.59 | −0.64 | 1.21 | 2.13 |
| MF Away14 | Attending a sporting event | 1.80 | −1.57 | 1.52 | 2.31 |
| MF Away15 | Taking a day trip away from home | 3.08 | −1.03 | 0.69 | 1.35 |
| MF Away16 | Taking an overnight trip away from home | 2.59 | −1.44 | 0.72 | 1.18 |
| MF Away17 | Taking a vacation away from home | 1.48 | −2.64 | 1.37 | 2.02 |
Abbreviations: Mental Fatigue (MF). 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?