Objective To explore the differences in gender and age among Chinese people with orthostatic intolerance （OI）. Methods Between January 2004 and June 2006,1069 patients with unexplained syncope, dizziness,chest distress, chest pain or palpitation were diagnosed or registered to Syncope Clinic of Second Xiangya Hospital, Central South University. These patients comprised 506 males and 563 females （ aged 3 - 72 years old, mean： 19. 22 ±14. 80 ）. Notably, children group included 728 cases （ 〈 18 y） and adult group 341 cases （ ≥ 18 y）. A...
