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. Author manuscript; available in PMC: 2013 Sep 1.
Published in final edited form as: Int J Gynaecol Obstet. 2012 Jun 20;118(3):242–246. doi: 10.1016/j.ijgo.2012.04.014

Figure 1.

Figure 1

Perception of lightheadedness during different phases of the menstrual cycle. Shown is self-reported lightheadedness during different phases of the menstrual cycle for patients with postural tachycardia syndrome (POTS) (unbroken line) and healthy controls (broken line). Severity of lightheadedness varied depending on the phase of the menstrual cycle, peaking in the menstrual phase. At each phase, patients with POTS perceived greater lightheadedness compared with control individuals (menstrual P<0.001; follicular P=0.001; mid-luteal P=0.01; late-luteal P=0.026).