title: [Application of capture-mark-recapture method on evaluating the abilities of birth defects surveillance systems].
abstract: OBJECTIVE
  To evaluate the abilities of population-based birth defects surveillance system (PBBDSS) and hospital-based birth defects surveillance system(HBBDSS).
  
  
  METHODS
  We used capture-mark-recapture method(CMR) to analyze the data of the two kinds of birth defects surveillance systems from 1 Oct. 2006 to 31 Dec. 2006 in a county of Hunan province. Data from PBBDSS were defined as the first source and data from HBBDSS were defined as the second source.
  
  
  RESULTS
  49 and 28 birth defect cases were found from PBBDSS and from HBBDSS respectively. Among these cases, 20 were marked. With the method of CMR, the estimated birth defects cases were 68 (95% CI: 56-70). The coincident rates of PBBDSS and HBBDSS were 72.1% and 41.2%, while the total coincident rates was 83.8% and the coincident rates from different sources was 57.1%. The unreported rates of PBBDSS and HBBDSS were 27.9% and 58.8%.
  
  
  CONCLUSIONS
  Not only the HBBDSS but also the PBBDSS appeared to have had high unreported rates, suggesting that we could use CMR to adjust the rate of birth defects from the birth defects surveillance data.
authors.affiliation: Department of Child Hygiene and Maternal Health, School of Public Health, Central South University, Changsha 410078, China.
authors.forename: Xun-Qiang
authors.initials: XQ
authors.lastname: Yin
authors.forename: Ya-Man
authors.initials: YM
authors.lastname: Li
authors.forename: Jia-You
authors.initials: JY
authors.lastname: Luo
authors.forename: Xiao-Juan
authors.initials: XJ
authors.lastname: Shi
authors.forename: Ting
authors.initials: T
authors.lastname: Yin
authors.forename: Rui
authors.initials: R
authors.lastname: Huang
authors.forename: Jing
authors.initials: J
authors.lastname: Chen
mesh_terms: D000013:Congenital Abnormalities / Q000175:diagnosis / Q000453:epidemiology*; D006801:Humans; D007231:Infant, Newborn; D011159:Population Surveillance / Q000379:methods*