TABLE 3.
Domains and Number of Questions Retained Based on Exploratory Factor Analysis and Clinical Revisions as Used in the Final Instrument (COMPASS 31)a
| Domain | No. of questions | Max raw score | Weighting factor | Max weighted score | Cronbach α |
|---|---|---|---|---|---|
| Orthostatic intolerance | 4 | 10 | 4.0 | 40 | 0.92 |
| Vasomotor | 3 | 6 | 0.83333333 | 5 | 0.91 |
| Secretomotor | 4 | 7 | 2.1428571 | 15 | 0.48 |
| Gastrointestinalb | 12 | 28 | 0.8928571 | 25 | 0.78 |
| Bladder | 3 | 9 | 1.1111111 | 10 | 0.62 |
| Pupillomotor | 5 | 15 | 0.3333333 | 5 | 0.84 |
| Total | 31 | 75 | 100 |
a
Appropriate weighting factors for each domain result in appropriately balanced autonomic domains and a total score between 0 and 100. Max = maximum.
b
Combines former constipation, diarrhea, and gastroparesis domains into one domain.