passages: PMC-2713402-sec-09__text
passages: sec
passages: Statistical Analysis
  Mitochondrial DNA haplogroup frequencies were calculated by counting from the observed genotypes. The Pearson chi-square test and the chi-square test for linear-by-linear association were used to analyze the significances between the prevalence of haplogroups and different age groups. SPSS software (version 10.0) was used.
  