Chen Xiao-Bing, Cai Wei-Xiong
Department of Forensic Medicine, Medical College of Soochow University, Suzhou 215123, China.
Fa Yi Xue Za Zhi. 2013 Apr;29(2):99-102.
According with Chinese legal system, to develop a competency to stand trial rating scale in offenders with mental disorders.
Proceeding from the juristical elements, 15 items were extracted and formulated a preliminary instrument named the competency to stand trial rating scale in offenders with mental disorders. The item analysis included six aspects, which were critical ratio, item-total correlation, corrected item-total correlation, alpha value if item deleted, communalities of items, and factor loading. The Logistic regression equation and cut-off score of ROC curve were used to explore the diagnostic efficiency.
The data of critical ratio of extreme group were 18.390-46.763; item-total correlation, 0.639-0.952; corrected item-total correlation, 0.582-0.944; communalities of items, 0.377-0.916; and factor loadings, 0.614-0.957. Seven items were included in the regression equation and the accuracy of back substitution test was 96.0%. The score of 33 was ascertained as the cut-off score by ROC fitting curve, the overlapping ratio compared with the expertise was 95.8%. The sensibility and the specificity were 0.938 and 0.966, respectively, while the positive and negative likelihood ratios were 27.67 and 0.06, respectively.
With all items satisfied the requirement of homogeneity test, the rating scale has a reasonable construct and excellent diagnostic efficiency.
依据中国法律制度，编制精神障碍罪犯受审能力评定量表。
从法学要素出发，提取15个条目，初步形成精神障碍罪犯受审能力评定量表。项目分析包括临界比率、项目与总分的相关性、校正的项目与总分的相关性、删除项目后的α系数、项目共同度、因子负荷6个方面。采用Logistic回归方程及ROC曲线截断值探索诊断效能。
极端组临界比率数据为18.390～46.763；项目与总分的相关性为0.639～0.952；校正的项目与总分的相关性为0.582～0.944；项目共同度为0.377～0.916；因子负荷为0.614～0.957。回归方程纳入7个条目，回代检验准确率为96.0%。经ROC拟合曲线确定截断值为33分，与专家评定的重叠率为95.8%。灵敏度和特异度分别为0.938和0.966，阳性似然比和阴性似然比分别为27.67和0.06。
该评定量表各条目均符合同质性检验要求，结构合理，诊断效能良好。
