非常に引用されている臨床研究で矛盾し,当初より強い効果が出た
1Department of Hygiene and Epidemiology, University of Ioannina School of Medicine, Ioannina, Greece. jioannid@cc.uoi.gr
JAMA
|July 15, 2005
まとめ
よく引用されている臨床研究は,しばしば矛盾したり,後の研究よりも強い効果を示したりします. 非ランダム化研究は矛盾する傾向が強いが,ランダム化試験でさえ,特に小規模な試験は反証できる.
科学分野:
- クリニック・リサーチ 臨床研究
- 医療介入 医療介入について
- 研究の影響力研究の影響力
背景:
- 論争は,臨床研究の結果が矛盾しているときに生じます.
- ハイインパクトの研究は,特に議論を起こす傾向があります.
- 影響力のある研究における反論パターンを理解することは極めて重要です.
研究 の 目的:
- 引用数が多い臨床試験における矛盾や誇張された効果の頻度を判断する.
- 時間の経過とともに影響力のある研究の反証に関連した特徴を特定する.
主な方法:
- 1990年から2003年にかけて発表された臨床研究の解析,引用回数は1000回以上.
- 引用数が多い研究と,その後の比較可能な研究を比較する.
- 比較分析と一致した,引用数が少ない研究を比較した.
主要な成果:
- 引用数が多い研究のうち16%が矛盾しており,16%が後の研究よりも強い効果を示していた.
- 非ランダム化高度に引用された研究は,ランダム化制御試験 (P = .008) よりも頻繁に反論された.
- 小規模なランダム化試験は,矛盾する可能性が高く,より強い効果を示した (P = .009).
結論:
- 矛盾と誇張された効果は,非常に引用されている臨床介入研究において一般的です.
- 高度引用された非ランダム化研究は,論争に最も敏感です.
- 非常に引用されているランダム化試験,特に小規模な試験でさえ,挑戦され,反証することができます.
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