Cameriere Roberto, Velandia Palacio Luz Andrea, Pinares Jorge, Bestetti Fiorella, Paba Rossella, Coccia Erminia, Ferrante Luigi
AgEstimation Project, University of Macerata, Via Don Minzoni, 9, 62100, Italy.
Área de Radiología, Departamento de Patología y Medicina Oral, Facultad de Odontología, Universidad de Chile and Escuela de Odontología, Facultad de Medicina, Pontificia Universidad Católica de Chile, Sergio Livingstone Polhammer 943, Independencia, Santiago, Chile.
Forensic Sci Int. 2018 Apr;285:205.e1-205.e5. doi: 10.1016/j.forsciint.2017.12.043. Epub 2018 Jan 8.
This retrospective cross-sectional study has two-fold aims: the first is to assess new cut-offs at the legal age thresholds (LATs) of 14 and 16 years old and the second is to validate the cut-off of third molar index I=0.08 for 18 years of age in Chilean people. Orthopantomographs from 822 Chilean children aged from 11 to 22 (472 girls and 350 boys) were analysed. For LAT of 14 years, cut-offs were found using the ROC curves singly for boys and girls. The cut-offs for boys were I=0.16 and I=0.73 while for girls we obtained I=0.10 and I=0.77. For LAT of 16 years we obtained the same cut-offs regardless of gender, which were 0.06 and 0.36 for I and I respectively. Concerning the validity of I cut-off for 18 years old in Chilean population, the proportion of correctly classified individuals was 83% and estimated post-test probability, PPV, was 93.2%, with a 95% confidence interval equals to 91.3%, 94.6%. Hence, the probability that a subject positive on the test was 18 years of age or older was 93.2%, confirming the validation of the I cut-off for Chilean population.
第一个目标是评估14岁和16岁法定年龄阈值（LATs）时的新临界值，第二个目标是验证智利人群中18岁时第三磨牙指数I = 0.08的临界值。分析了822名年龄在11至22岁之间的智利儿童（472名女孩和350名男孩）的曲面断层片。对于14岁的LAT，分别使用ROC曲线为男孩和女孩确定临界值。男孩的临界值为I = 0.16和I = 0.73，而女孩的临界值为I = 0.10和I = 0.77。对于16岁的LAT，无论性别如何，我们得到的临界值相同，I和I分别为0.06和0.36。关于智利人群中18岁时I临界值的有效性，正确分类个体的比例为83%，估计的检验后概率（PPV）为93.2%，95%置信区间等于91.3%，94.6%。因此，检测呈阳性的受试者年龄为18岁或以上的概率为93.2%，证实了智利人群中I临界值的有效性。
