title: Epidemiological features of infantile hypertrophic pyloric stenosis in Taiwan: a national study 1996-2004.
abstract: OBJECTIVE
  The incidence of infantile hypertrophic pyloric stenosis (IHPS) varies among different countries and is supposed to be lower in Asian countries than in Western countries. However, the incidence of IHPS in Taiwan has not been well investigated.
  
  
  METHODS
  The National Health Insurance (NHI) program was implemented in Taiwan in 1995 and covers most of the population (>99%). We used the NHI database to investigate the epidemiological features of IHPS in Taiwan and to compare the data with that of other countries.
  
  
  RESULTS
  We identified 962 new IHPS cases during the period from 1996 to 2004. The overall incidence of IHPS was 0.39 (0.34-0.50) cases per 1000 live births. The estimation was 0.39-0.59 per 1000 live births after adjustment for the misdiagnosis rate. The peak incidence (0.58 per 1000 live births) occurred in winter in 1999. Rates were consistently higher in male subjects. The 1-year survival rate was not significantly different in the patients receiving pyloromyotomy in medical centers, regional hospitals, and district hospitals (P=0.389).
  
  
  CONCLUSIONS
  Taiwan had the second lowest incidence of IHPS reported in the medical literature. IHPS patients can be successfully treated in district and general hospitals with good prognosis.
authors.affiliation: Department of Pediatrics, Chang Gung Memorial Hospital, Kaohsiung Medical Center, Chang Gung University College of Medicine, Kaohsiung, Taiwan.
authors.forename: Mao-Meng
authors.initials: MM
authors.lastname: Tiao
authors.forename: Shang-Shyue
authors.initials: SS
authors.lastname: Tsai
authors.forename: Hsin-Wei
authors.initials: HW
authors.lastname: Kuo
authors.forename: Chun-Yuh
authors.initials: CY
authors.lastname: Yang
mesh_terms: D016009:Chi-Square Distribution; D013505:Digestive System Surgical Procedures / Q000401:mortality; D005260:Female; D006306:Health Surveys; D006767:Hospitals, District / Q000706:statistics & numerical data; D006769:Hospitals, General / Q000706:statistics & numerical data; D006801:Humans; D015994:Incidence; D007223:Infant; D007231:Infant, Newborn; D053208:Kaplan-Meier Estimate; D016014:Linear Models; D008297:Male; D009313:National Health Programs / Q000706:statistics & numerical data; D016017:Odds Ratio; D046248:Pyloric Stenosis, Hypertrophic / Q000175:diagnosis / Q000453:epidemiology* / Q000401:mortality / Q000601:surgery; D018570:Risk Assessment; D012307:Risk Factors; D012621:Seasons; D015996:Survival Rate; D013624:Taiwan / Q000453:epidemiology; D013997:Time Factors; D016896:Treatment Outcome