TABLE 1.

Comparison of Internal Consistency of the Previously Used Domains Using Old and New COMPASS Scoring Algorithms^a

Domain	COMPASS—previous scoring algorithm				COMPASS—new scoring algorithm
		Cronbach α coefficient				Cronbach α coefficient
	No. of items	All (405)	Females (239)	Males (166)	No. of items	All (405)	Females (239)	Males (166)
Orthostatic intolerance	9	0.79	0.79	0.78	28	0.90	0.91	0.88
Vasomotor	11	0.68	0.69	0.57	11	0.84	0.85	0.80
Secretomotor	8	0.34	0.28	0.42	13	0.52	0.55	0.44
Gastroparesis	5	0.50	0.52	0.35	7	0.66	0.69	0.56
Constipation	4	−0.32	−0.33	−0.22	10b	0.82b	0.81b	0.85b
Diarrhea	4	−0.89	−0.95	−0.82
Bladder	3	0.53	0.42	0.74	3	0.58	0.48	0.74
Pupillomotor	7	0.55	0.57	0.47	11	0.87	0.86	0.88
Sleep	8	0.36	0.31	0.39	8	0.40	0.44	0.33
Syncope	5	0.13	−0.01	0.36	NA	NA	NA	NA
Male erectile dysfunction	8	0.75	NA	0.75	NA	NA	NA	NA
Total	72				91

^aNA = not applicable.

^bConstipation and diarrhea domains were combined.