Table 1.
Thirteen-Item PAM with Item Calibrations
| Meas | SEM | Infit | Outfit | |
|---|---|---|---|---|
| 1. When all is said and done, I am the person who is responsible for managing my health condition | 38.6 | 0.4 | 0.99 | 0.97 |
| 2. Taking an active role in my own health care is the most important factor in determining my health and ability to function | 41.1 | 0.4 | 1.01 | 0.93 |
| 3. I am confident that I can take actions that will help prevent or minimize some symptoms or problems associated with my health condition | 41.5 | 0.4 | 0.93 | 0.85 |
| 4. I know what each of my prescribed medications do | 42.5 | 0.5 | 1.05 | 1.01 |
| 5. I am confident that I can tell when I need to go get medical care and when I can handle a health problem myself | 43.7 | 0.4 | 1.05 | 0.98 |
| 6. I am confident I can tell my health care provider concerns I have even when he or she does not ask | 43.8 | 0.4 | 0.92 | 0.86 |
| 7. I am confident that I can follow through on medical treatments I need to do at home | 45.3 | 0.4 | 0.94 | 0.87 |
| 8. I understand the nature and causes of my health condition(s) | 47.0 | 0.4 | 1.01 | 0.95 |
| 9. I know the different medical treatment options available for my health condition | 49.8 | 0.4 | 0.92 | 0.87 |
| 10. I have been able to maintain the lifestyle changes for my health that I have made | 50.5 | 0.4 | 1.04 | 1.01 |
| 11. I know how to prevent further problems with my health condition | 51.2 | 0.4 | 0.96 | 0.92 |
| 12. I am confident I can figure out solutions when new situations or problems arise with my health condition | 52.3 | 0.4 | 1.03 | 1.07 |
| 13. I am confident that I can maintain lifestyle changes like diet and exercise even during times of stress | 53.0 | 0.4 | 1.05 | 1.11 |
Meas: The calibrated scale value of the item. This represents how much activation is required to endorse the item.
SEM: The standard error of measurement in estimation of the item difficulty. SEM is the precision of the item difficulty estimation and is shown in 0–100 units.
Infit: Infit mean square error is one of two quality control fit statistics assessing item dimensionality (the degree to which the item falls on the same single, real number line as the rest of the items). Infit is an information-weighted residual of observed responses from model expected responses and is most sensitive to item fit when the item is located near the person's scale location.
Outfit: Outfit mean square error fit statistic is most sensitive to item dimensionality when the item scale location is distant from the person's scale location.
PAM, Patient Activation Measure.