Methods CPI of 13 CODIS (combined DNA index system) loci for 108 trio cases and 108 duo cases selected randomly were calculated by using five Chinese Han population allele frequencies, respectively.

• 方法随机取108例13个CODIS基因座分型结果不排除父权关系的三联体案和二联体案，用5个不同地区人群的等位基因频率计算CPI值。