TABLE 2.

Domains Identified, Cronbach α Coefficients, and Number of Questions Retained Within Each Domain Based Solely on Statistical Measures (Exploratory Factor Analysis) With Factor Loading ≥0.40^a

Domains	Cronbach α coefficient	No. of questions
Orthostatic intolerance	0.93	17
Vasomotor	0.91	9
Secretomotor	0.71	4
Gastrointestinal—mixed upper and diarrhea	0.87	8
Constipation	0.89	4
Bladder	0.79	2
Pupillomotor	0.90	10

^aIncludes all 405 study subjects.