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傷患 者は
  症鉄 道外    より
重
      ェンスに
 ー ムフ     か? 科歯科大学 究科
ホ
     せら れる 東京医
 減 少さ       大学院
                医歯学
                    総合研
                   医学
              救急災害

白石 淳   遠藤 彰

加地正人   大友康裕
違いがわかりますか?




JR 御茶ノ水駅   東京メトロ御茶ノ水駅
重症鉄道外傷
本研究では、

 – 鉄道駅で発生
 – 動いている電車と接触
 – 搬送後、死亡または入院した傷病者


と、定義しました。
重症鉄道外傷
• 公表された統計資料は不十分。
    – 自殺者や第三者行為が含まれないなど。
•   本学 ER には、年間約 8 例が搬送される。
•   40% が自殺者。
•   65% が死亡する。
•   95% !が死亡または寝たきり状態に。
対象



• 東京医科歯科大学から直線距離 2km 以内
  の鉄道駅( N=43 )

 注:ヒトを対象とする臨床研究ではないのです。
統計解析
• 重回帰分析
• 有意水準  P<0.05
• 説明変数
 – 1 日の乗降客数
 – 当センターまでの直線距離
 – ホームフェンス設置の有無
• アウトカム
 – 各駅での重症鉄道外傷発生数
結果
          (N=43, アウトカム =20)
説明変数              係数          P
切片                1.32
乗降客数 (/105/ 日 )   0.00    NS
本学からの距離 (/km)     -0.60   0.01
ホームフェンスの有無        -0.66   0.01
( 有 =1, 無 =0)
全発生数の相対リスク比




JR 御茶ノ水駅   東京メトロ御茶ノ水駅
RR = 2.2     RR = 1.0
制限事項
• サンプルサイズ
 – 特にアウトカム


• 単一医療機関のデータを基にした解析
 – 各鉄道会社からのデータを集計するのがベス
   ト
結語


ホームフェンスは重症鉄道外傷を少な
くとも半減させるであろう。

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