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. 2017 Jun 7;12(6):e0179132. doi: 10.1371/journal.pone.0179132

Fig 2. Blood pressure variability according to symptom severity and orthostatic vital signs.

Fig 2

(A) Blood pressure variability (BPV) measured by the standard deviation (BPVSD [mmHg]) between patients with mild (n = 56) and severe (n = 47) orthostatic intolerance symptoms. (B) BPV measured by the coefficient of variation (BPVCV [%]) between the mild and severe symptom groups. (C, D) BPV differences according to orthostatic vital sign responses: OH (n = 33), POTS (n = 27), and normal (n = 43). (C) BPVSD (mmHg) among the three groups. Post-hoc test: total systolic BPVSD (OH vs. normal, p = 0.038; OH vs. POTS, p = 0.045), sleep systolic BPVSD (OH vs. normal, p = 0.021; OH vs. POTS, p = 0.008). (D) BPVCV (%) among OH, POTS, and normal groups. Post-hoc test: sleep systolic BPVCV (OH vs. normal, p = 0.067; OH vs. POTS, p = 0.04). Abbreviations: SBP, systolic blood pressure; DBP, diastolic blood pressure; OI, orthostatic intolerance; OH, orthostatic hypotension; POTS, postural orthostatic tachycardia syndrome. * p < 0.05, ** p < 0.01. Error bars indicate the standard deviation.