Table 2. Sensitivity and specificity of drops of sitting BP in the diagnosis of OH and sOH.

	Patients with MSA								Patients with PD
	prediction of sitting SBP for OH		prediction of sitting DBP for OH		prediction of sitting SBP for sOH		prediction of sitting DBP for sOH		prediction of sitting SBP for OH		prediction of sitting DBP for OH
Cutoffs (mmHg)	Sn. %	Sp. %	Sn. %	Sp. %	Sn. %	Sp. %	Sn. %	Sp. %	Sn. %	Sp. %	Sn. %	Sp. %
0	100	13.56	97.01	17.19	100	8.51	97.3	12.77	100	16.92	100	18.64
2	97.22	23.73	83.58	46.88	100	17.02	94.59	41.49	100	60.2	64.52	76.27
4	97.22	27.12	80.6	68.75	100	19.15	91.89	57.45	100	61.69	61.29	82.49
6	97.22	37.29	77.61	84.38	100	25.53	91.89	70.21	100	67.16	61.29	84.75
8	94.44	44.07	70.15	90.63	100	31.91	89.19	78.72	100	80.1	45.16	92.66
10	93.06	59.32	53.73	93.75	97.3	41.49	75.68	87.23	100	81.59	41.94	94.35
12	83.33	72.88	23.88	100	94.59	56.38	40.54	98.94	57.14	96.52	12.9	99.44
14	76.39	88.14	20.9	100	91.89	70.21	35.14	98.94	42.86	98.01	6.45	99.44
16	70.83	89.83	16.42	100	89.19	74.47	27.03	98.94	28.57	98.01	3.23	100
18	55.56	93.22	13.43	100	81.08	85.11	21.62	98.94	28.57	99	3.23	100
20	48.61	93.22	8.96	100	70.27	86.17	13.51	98.94	28.57	99.5	0	100

Abbreviations: MSA = multiple system atrophy; PD = Parkinson disease; OH = orthostatic hypotension; sOH = severe orthostatic hypotension; SBP = systolic blood pressure; DBP = diastolic blood pressure; Sn = sensitivity; Sp = specificity.

The bold indicates sensitivity and specificity corresponding to the optimum cutoffs.