Palavesam Azhahianambi, Selvakumar R, Latha Bhaskaran Ravi, Jyothimol G, Venkataramanan R, Harikrishnan T J
Department of Veterinary Parasitology, Madras Veterinary College, Tamil Nadu Veterinary and Animal Sciences University (TANUVAS), Chennai 600007, India; Translational Research Platform for Veterinary Biologicals, Tamil Nadu Veterinary and Animal Sciences University (TANUVAS), Chennai 600051, India.
Department of Forensic Medicine, Government Kilpauk Medical College, Chennai 600010, India.
Leg Med (Tokyo). 2023 Mar;61:102210. doi: 10.1016/j.legalmed.2023.102210. Epub 2023 Jan 26.
This study is based on blow fly samples collected from 8 medico-legal cases in Tamil Nadu, India. The fly life stages were identified and the consistency of minimum post-mortem intervals (PMImin) estimated by different thermal summation-based methods was assessed.
PMImin of 8 medico-legal cases was estimated using six different thermal summation constants and lower developmental temperatures that are based on C. megacephala and C. rufifacies developmental data. Limits of agreement (LoA), intra class correlation coefficient (ICC) between PMImin values and margin of error of mean of difference between PMImin values were calculated.
Intra-class correlation between the PMImin values estimated using different thermal summation constants based on C. megacephala ranged between 0.89 and 0.98 and coefficient of determination ranged between 0.93 and 0.98. Intra-class correlation between the PMImin values estimated using different thermal summation constants based on C. rufifacies ranged between 0.91 and 0.99 and coefficient of determination ranged between 0.95 and 0.99. The mean difference of PMImin values estimated using different thermal summation methods based on C. megacephala ranged between 1.8 hr and 6.6hr and margin of error ranged between 2.51 and 6.93hr. The mean difference of PMImin values estimated using different thermal summation methods based on C. rufifacies ranged between 3.33 and 31.33hr and margin of error ranged between 4.66 and 32hr.
Consistency of PMImin values estimated by different thermal summation methods was good to excellent. Thermal summation constants useful in estimation of PMImin with lowest mean difference and margin of error were described.
本研究基于从印度泰米尔纳德邦8起法医学案件中采集的丽蝇样本。鉴定了蝇的生活阶段，并评估了不同基于热积累方法估计的最短死后间隔时间（PMImin）的一致性。
使用基于大头金蝇和红金蝇发育数据的六个不同热积累常数和较低发育温度，估计8起法医学案件的PMImin。计算一致性界限（LoA）、PMImin值之间的组内相关系数（ICC）以及PMImin值之间差异均值的误差范围。
基于大头金蝇使用不同热积累常数估计的PMImin值之间的组内相关性在0.89至0.98之间，决定系数在0.93至0.98之间。基于红金蝇使用不同热积累常数估计的PMImin值之间的组内相关性在0.91至0.99之间，决定系数在0.95至0.99之间。基于大头金蝇使用不同热积累方法估计的PMImin值的平均差异在1.8小时至6.6小时之间，误差范围在2.51至6.93小时之间。基于红金蝇使用不同热积累方法估计的PMImin值的平均差异在3.33至31.33小时之间，误差范围在4.66至32小时之间。
不同热积累方法估计的PMImin值的一致性良好至优秀。描述了在估计PMImin时具有最低平均差异和误差范围的有用热积累常数。
