Fig. 2

Average Recumbent and Standing Dizziness and Lightheadedness Scores in POTS, STOPP, and START. Each pair of symbols shows the average scores while recumbent (left) and standing (right). CFS POTS (blue), STOPP (red), and START (green) had significantly higher symptoms between recumbent Dizziness and Lightheadedness after 5 min of standing. In contrast, controls had no significant changes in symptoms between the average of all recumbent and standing measurements even if they had postural tachycardia before and after (POTS, blue) or only after exercise (START, green). Black bars indicate P < 0.05, Wilcoxon Signed-Rank test between recumbent and standing symptoms