title: [Analysis of P interval dispersion and its correlative factors among Chinese].
abstract: OBJECTIVE
  To establish mean value of P interval dispersion of 12-lead simultaneous body surface electrocardiogram in healthy Chinese and to analyse its correlative factors.
  
  
  METHODS
  12-lead simultaneous body surface electrocardiogram data were taken from 2078 healthy Chinese aged from 1 to 87 [mean (39.4 +/- 17.3)] years with SR-1000A automated electrocardiography made by Zhongshan, Guangdong province. These data were stored in the floppy disk.
  
  
  RESULTS
  Mean value of Pmax, Pmin, Pd and Pcd seemed to be prolonged, and Pcmax, Pcmin to be shortened with increasing of age, but there was no significant difference between age and sex. Mean value of Pmax of the all subjects (1-87 years) was (109.85 +/- 7.88) ms, Pmin (80.97 +/- 11.42) ms, Pcmax (123.13 +/- 12.00) ms, Pcmin (90.85 +/- 14.40) ms, Pd (28.89 +/- 10.74) ms, Pcd (32.39 +/- 12.10) ms; mean values of Pmax, Pmin, Pd and Pcd among the children of 1-14 years were (101.54 +/- 9.49) ms, (76.85 +/- 10.19) ms, (24.82 +/- 7.51) ms and (31.10 +/- 9.89) ms, respectively; 77.04% of Pmax was in II lead and 14.39% in V5 lead, 74.69% of Pmin was in V1 lead and 7.84% in V2 lead.
  
  
  CONCLUSIONS
  The mean value of Pmax is 96-120 ms, Pd 8-50 ms and Pcd 10-56 ms among healthy Chinese. Pd is not significantly related with heart rate, age and sex.
authors.affiliation: Department of Cardiovascular Pediatric, The Second Xinagya Hospital, Central South University, Changsha 410011, China.
authors.forename: C
authors.initials: C
authors.lastname: Wang
authors.forename: Z W
authors.initials: ZW
authors.lastname: Xie
authors.forename: M X
authors.initials: MX
authors.lastname: Li
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D044466:Asian People; D002648:Child; D002675:Child, Preschool; D004562:Electrocardiography / Q000379:methods / Q000706:statistics & numerical data*; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D008403:Mass Screening; D008875:Middle Aged; D012015:Reference Standards