College of Transportation Engineering, Tongji University, Key Laboratory of Road and Traffic Engineering of the State Ministry of Education, Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety, PR China.
School of Transport & Communications, Shanghai Maritime University, 1550 Haigang Street, Shanghai 201306, PR China.
J Affect Disord. 2019 Jun 15;253:63-68. doi: 10.1016/j.jad.2019.04.014. Epub 2019 Apr 8.
Metro suicide can cause tremendous effects on the general public. Platform screen doors (PSDs) have been identified as one of the most effective methods of suicide prevention at metro stations. However, there are few studies focusing on their effectiveness in preventing suicides. In particular, the effect of types of PSDs, including full-height and half-height PSDs, has rarely been assessed and compared.
Based on the suicide data provided by the Shanghai metro operator, the effectiveness of installing different types of PSDs for preventing metro suicides was investigated using a Poisson regression model. Ten-year monthly panel data for 94 metro stations from 2008 to 2017 were used in this study.
The number of metro suicides declined by 90.9% after the PSDs were installed at metro stations. In addition, different types of PSDs had different effects on decreasing the number of suicides, and a higher half-height PSD was more effective in preventing suicides. Specifically, full-height PSDs could eliminate metro suicides by completely preventing passengers from entering the track area, while half-height PSDs that were 1.5 m and 1.2 m high could decrease the number of suicides by 79.2% and 60.2%, respectively. Moreover, there was no significant indication that the installation of PSDs at metro stations displaced suicides to railway stations without PSDs (p = 0.706).
The potential economic benefits of different types of PSDs were not considered in our study. In addition, we did not examine whether suicide attempters would try to take their own lives by using other methods of suicide.
The installation of PSDs, especially full-height PSDs, could be very effective in preventing suicides at metro stations. Although half-height PSDs are less effective than full-height PSDs, increasing the height of half-height PSDs could be an effective way of enhancing their effectiveness in reducing the number of suicides.
地铁自杀会对公众造成巨大影响。站台屏蔽门（PSD）已被确定为防止地铁站自杀的最有效方法之一。然而，很少有研究关注它们在预防自杀方面的有效性。特别是，全高和半高 PSD 等不同类型 PSD 的效果很少被评估和比较。
根据上海地铁运营商提供的自杀数据，利用泊松回归模型研究了安装不同类型 PSD 对预防地铁自杀的效果。本研究使用了 2008 年至 2017 年 94 个地铁站的十年每月面板数据。
PSD 安装在地铁站后，地铁自杀人数减少了 90.9%。此外，不同类型的 PSD 对减少自杀人数有不同的效果，较高的半高 PSD 更有效地预防自杀。具体来说，全高 PSD 可以通过完全阻止乘客进入轨道区域来消除地铁自杀事件，而 1.5 米和 1.2 米高的半高 PSD 则可以分别减少 79.2%和 60.2%的自杀事件。此外，没有迹象表明地铁站 PSD 的安装会将自杀事件转移到没有 PSD 的火车站（p=0.706）。
本研究未考虑不同类型 PSD 的潜在经济效益。此外，我们没有检查自杀未遂者是否会尝试使用其他自杀方式自杀。
安装 PSD，特别是全高 PSD，对防止地铁站自杀非常有效。虽然半高 PSD 的效果不如全高 PSD，但增加半高 PSD 的高度可以有效地提高其减少自杀人数的效果。
