Table 2.

Quartiles based on SBP reaction during orthostatic test

	n	Cut-off SBP reaction	Mean SBP decrease
ortSBP1	1471	-66.0 ­– -10.5	-16.5
ortSBP2	1505	-10.0 – -4.0	-6.8
ortSBP3	1452	-3.5 – 2.5	-0.7
ortSBP4	1425	3.0 – 47.5	9.2

Blood pressure reaction was defined as the difference between supine blood pressure and orthostatic blood pressure (supine blood pressure subtracted by orthostatic blood pressure). Thus, a negative blood pressurereaction represents an increased blood pressure during the orthostatic test