ノルウェーの70歳以上の人の認知症発生率: HUNT研究
Inger Molvik1,2,3, Bjørn Heine Strand1,3,4, Anne Marie Mork Rokstad1,5
1The Norwegian National Centre for Ageing and Health, Vestfold Hospital Trust, Tønsberg, Norway.
Journal of Alzheimer's disease : JAD
|August 29, 2025
まとめ
70歳以上の人の認知症の発生率は,以前に推定されたより高い. 多くの症例は軽度の認知障害 (MCI) の後に発症し,一部の症例は正常な認知に戻り,早期発見と介入戦略の必要性を強調しています.
科学分野:
- ゲロントロジー
- 神経学
- 流行病学
背景:
- 人口の長生きは 認知症の流行を増加させるため 発生率の正確なデータが必要です
- アルツハイマー病と認知症は重要な公衆衛生問題であり,最新の推定が必要である.
- 効果的な医療計画とリソースの配分には,高品質の発生データが不可欠です.
研究 の 目的:
- 70歳以上の人々の認知症の発生率を 精確に推定する.
- 高齢者における軽度の認知障害 (MCI) を含む認知状態の進行を分析する.
- 将来の認知症症例数と 医療システムへの影響を予測する
主な方法:
- 長期コホート研究 (HUNT4 70+) で,追跡期間は4年.
- 年齢別認知症発生率の計算
- ノルウェーの人口に対して,反応の欠如と死亡率の逆確率の加重を適用し,標準化.
主要な成果:
- 認知症の累積発生率は4. 2年間で5229人の認知症のない個体で14. 3%であった.
- 新発性認知症患者の33. 8%は認知障害がなかったが,他の患者は軽度の認知障害 (MCI) を有していた.
- MCIを患った患者のうち,25. 5%が正常な認知能力を回復し,48. 2%がMCIを保持し,26. 2%が認知症を発症した. 体重計の発生率は1000人当たり43. 9であった.
結論:
- 70歳以上の人口における認知症の発生率は,以前の病院ベースの推定値を超えています.
- 軽度の認知障害 (MCI) はしばしば認知症に先行し,正常な認知に回復する割合が著しい.
- 認知症の症例は2050年までに ほぼ2倍になると予測され 医療計画と早期介入戦略の強化が求められます
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