Table 2.
Reliability of 13-Item PAM Compared with 22-Item PAM
| Rasch Person PAM 13 | Rasch Person PAM 22 | ||||||
|---|---|---|---|---|---|---|---|
| n | % | Pam13 Score | Real | Model | Real | Model | |
| Sample | 1,469 | 100 | 61.9 | 0.81 | 0.85 | 0.87 | 0.91 |
| Gender: male | 543 | 37 | 60.2 | 0.80 | 0.84 | 0.87 | 0.90 |
| Female | 926 | 63 | 62.8 | 0.82 | 0.85 | 0.89 | 0.91 |
| Age group | |||||||
| 45–54 | 512 | 38 | 63.9 | 0.82 | 0.85 | 0.88 | 0.91 |
| 55–64 | 398 | 28 | 61.7 | 0.81 | 0.85 | 0.88 | 0.91 |
| 65–74 | 290 | 20 | 61.9 | 0.80 | 0.84 | 0.89 | 0.91 |
| 75–84 | 185 | 13 | 58.2 | 0.78 | 0.83 | 0.87 | 0.90 |
| 85 or older | 33 | 2 | 55.3 | 0.69 | 0.72 | 0.76 | 0.82 |
| Self-rated health | |||||||
| Poor | 102 | 7 | 54.3 | 0.73 | 0.78 | 0.83 | 0.87 |
| Fair | 236 | 16 | 57.3 | 0.78 | 0.83 | 0.84 | 0.88 |
| Good | 411 | 28 | 59.3 | 0.78 | 0.82 | 0.84 | 0.87 |
| Very good | 465 | 31 | 64.3 | 0.79 | 0.83 | 0.87 | 0.90 |
| Excellent | 255 | 18 | 68.7 | 0.83 | 0.85 | 0.89 | 0.91 |
| Race | |||||||
| White | 1,287 | 88 | 62.1 | 0.81 | 0.85 | 0.88 | 0.91 |
| Black | 111 | 8 | 58.6 | 0.78 | 0.82 | 0.84 | 0.88 |
| Other | 64 | 5 | 63.4 | 0.84 | 0.87 | 0.89 | 0.92 |
| Education | |||||||
| High school or less | 633 | 43 | 58.5 | 0.75 | 0.80 | 0.84 | 0.88 |
| Some college | 374 | 26 | 61.8 | 0.82 | 0.86 | 0.89 | 0.91 |
| College graduate+ | 454 | 31 | 66.6 | 0.82 | 0.85 | 0.89 | 0.91 |
| Household income | |||||||
| Less than $15,000 | 213 | 16 | 57.0 | 0.77 | 0.82 | 0.86 | 0.89 |
| $15,000–$24,999 | 199 | 16 | 58.5 | 0.79 | 0.84 | 0.87 | 0.90 |
| $25,000–$34,999 | 157 | 12 | 60.7 | 0.78 | 0.82 | 0.84 | 0.88 |
| $35,000–$49,999 | 224 | 17 | 62.6 | 0.81 | 0.85 | 0.87 | 0.90 |
| $50,000–$74,999 | 225 | 17 | 64.6 | 0.82 | 0.85 | 0.88 | 0.91 |
| $75,000 or more | 272 | 21 | 65.8 | 0.80 | 0.84 | 0.88 | 0.90 |
| Chronic condition | |||||||
| None | 311 | 21 | 63.1 | 0.78 | 0.82 | 0.87 | 0.90 |
| Angina/heart problem | 186 | 13 | 58.0 | 0.82 | 0.86 | 0.88 | 0.90 |
| Arthritis | 561 | 38 | 60.4 | 0.82 | 0.85 | 0.89 | 0.91 |
| Chronic pain | 362 | 25 | 59.1 | 0.83 | 0.86 | 0.88 | 0.91 |
| Depression | 212 | 15 | 58.5 | 0.81 | 0.85 | 0.87 | 0.89 |
| Diabetes | 170 | 11 | 59.7 | 0.79 | 0.83 | 0.88 | 0.91 |
| Hypertension | 498 | 34 | 59.7 | 0.80 | 0.84 | 0.88 | 0.91 |
| Lung disease | 177 | 12 | 60.1 | 0.83 | 0.86 | 0.87 | 0.91 |
| Cancer | 79 | 5 | 60.1 | 0.81 | 0.85 | 0.89 | 0.91 |
| High cholesterol | 445 | 30 | 60.9 | 0.81 | 0.85 | 0.89 | 0.91 |
Real person reliability is calculated under the assumption that all of the misfit in the responses is because of departure of the data from the model's expectations. Model person reliability is based on the assumption that the data fit model expectations and that the misfit in the data is because of the probabilistic nature of the model.
PAM, Patient Activation Measure.