title: [The prevalence of J wave in apparently healthy subjects in Hubei province of China].
abstract: OBJECTIVE
  To observe the prevalence of J wave in apparently healthy subjects in Wuhan.
  
  
  METHODS
  The study subjects comprised of 1817 apparently healthy subjects (1131 males, mean age 46.38 +/- 15.81 years; 686 females, mean age was 42.77 +/- 14.15 years). ECG and routine medical examinations were performed. J wave was defined as a wave followed QRS complexes with amplitude of at least 0.05 mV and 0.03 s.
  
  
  RESULTS
  The overall incidence of J wave was 7.26%. The incidence of J wave in males was significantly higher than in females (10.53% vs. 1.87%, P < 0.01). The incidence of J wave in leads of inferior wall (II, III, avF), right wall (V(1 - 3)) and left wall (V(4 - 6)) was 4.57%, 0.50%, and 2.20%, respectively. J wave located in leads of inferior wall was more than in left and right walls (both P < 0.05). The incidence of J wave positively correlated with age (y = 0.1387x + 1.6318, r = 0.78, P < 0.01).
  
  
  CONCLUSIONS
  J wave is more likely seen in males and aged people and is more likely located in leads of inferior wall, than in leads of left and right walls.
authors.affiliation: Department of Cardiology, Renming Hospital of Wuhan University, Wuhan 430060, China.
authors.forename: Yan-hong
authors.initials: YH
authors.lastname: Tang
authors.forename: Kui
authors.initials: K
authors.lastname: Chen
authors.forename: Cong-xin
authors.initials: CX
authors.lastname: Huang
authors.forename: Xi
authors.initials: X
authors.lastname: Wang
authors.forename: Ming-wei
authors.initials: MW
authors.lastname: Bao
authors.forename: Han-hua
authors.initials: HH
authors.lastname: Deng
authors.forename: Shu-ping
authors.initials: SP
authors.lastname: Hu
authors.forename: Gang-yan
authors.initials: GY
authors.lastname: Zhu
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002681:China / Q000453:epidemiology; D016757:Death, Sudden, Cardiac / Q000453:epidemiology* / Q000517:prevention & control; D004562:Electrocardiography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010808:Physical Examination; D015995:Prevalence; D055815:Young Adult