title: [Calculation of the avuncular index].
abstract: OBJECTIVE
  To introduce the method of avuncular index (AI) calculation.
  
  
  METHODS
  Identity by decent coefficient, coancestry coefficient and AI law were employed in identification of uncle-niece relationship, when autosomal STR loci were detected to determine controversial uncle-niece relationship.
  
  
  RESULTS
  The results of AI calculation were coincidental using identity by descent coefficien, coancestry coefficient and AI law.
  
  
  CONCLUSIONS
  The results are coincidental using three methods in the different situations. AI index is higher with participation of children's mother.
authors.affiliation: Department of Forensic Medicine, Zhongshan Medical College, Sun Yat-sen University, Guangzhou 510080, China. luhl@mail.sysu.edu.cn
authors.forename: Hui-Ling
authors.initials: HL
authors.lastname: Lu
authors.forename: Hong-Yu
authors.initials: HY
authors.lastname: Sun
authors.forename: Xue-Ling
authors.initials: XL
authors.lastname: Ou
authors.forename: De-Jian
authors.initials: DJ
authors.lastname: Lü
authors.forename: Ya-Qing
authors.initials: YQ
authors.lastname: Zhang
authors.forename: Li-Xian
authors.initials: LX
authors.lastname: Chen
mesh_terms: D000465:Algorithms; D000483:Alleles; D002877:Chromosomes, Human / Q000235:genetics*; D005190:Family; D005260:Female; D053803:Forensic Genetics / Q000379:methods; D005838:Genotype; D006579:Heterozygote; D006801:Humans; D008297:Male; D008957:Models, Genetic; D010334:Paternity; D011336:Probability; D020080:Tandem Repeat Sequences / Q000235:genetics