Table 3.
APAT reliability testing using AICC and coefficient alpha for each item and the overall scale
| Domain | Item | Mean score | 95% CI | Ceiling (%) | Floor (%) | AICC | Coefficient alpha |
|---|---|---|---|---|---|---|---|
| SF-BPIa | Worst | 2.5 | 2.0–3.0 | 2 | 43 | 0.83 | 0.93 |
| Least | 1.0 | 0.7–1.3 | 0 | 54 | 0.81 | 0.93 | |
| Average | 1.4 | 1.1–1.8 | 0 | 46 | 0.76 | 0.91 | |
| Current | 1.3 | 0.9–1.7 | 0 | 53 | 0.78 | 0.91 | |
| Pain Severity Test scale | 0.79 | 0.94 | |||||
| SF-MPQa | Continuous | 5.0 | 3.2–6.9 | 0 | 20 | 0.63 | 0.84 |
| Intermittent | 4.0 | 1.6–6.4 | 0 | 31 | 0.64 | 0.84 | |
| Neuropathic | 1.2 | 0.2–2.2 | 0 | 40 | 0.66 | 0.85 | |
| Affective | 1.4 | 0.5–2.3 | 0 | 38 | 0.53 | 0.77 | |
| Pain Quality Test scale | 0.62 | 0.86 | |||||
| EQ-5Da | Mobility | 1.5 | 0.8–2.1 | 0 | 47 | 0.53 | 0.85 |
| Self-care | 1.5 | 0.8–2.1 | 0 | 50 | 0.53 | 0.85 | |
| Usual activities | 1.6 | 1.0–2.2 | 0 | 43 | 0.53 | 0.85 | |
|
Pain and/or discomfort |
1.9 | 1.3–2.4 | 0 | 30 | 0.56 | 0.87 | |
| Anxiety and/or depression | 1.8 | 1.2–2.4 | 0 | 36 | 0.54 | 0.86 | |
| Health status | 81 | 77–85 | 2 | 16 | 0.87 | 0.97 | |
| HRQoL test scale | 0.59 | 0.90 | |||||
a
Although the NRS for each domain was standardized prior to inclusion in the model (as described in Materials and methods section), the original NRS for mean and CIs are displayed here. Values for the overall scales are in bold. HRQoL, health-related quality of life