認知機能と機能年齢の関連（第2報）―～NMスケール（N式老年者用精神状態評価尺度）得点とADL・IADL能力の関連～

The relationship between functional age and cognition (2nd report): The relationship between ADL/IADL function and the NM scale score

要旨：本研究は，行動観察によって高齢者の認知機能を評価するNMスケール（N式老年者用精神状態評価尺度）得点とADL・IADL能力の関連を調べることを目的とした．介護老人保健施設や通所リハビリテーションを利用する60歳以上の高齢者225名を対象として，NMスケール得点とこどもの発達に基づいて作成したADL・IADL評価表から決定した機能年齢の関連を相関係数の検定と単回帰分析で解析した．NMスケール得点と機能年齢の間に強い相関を認め，予測精度が高い回帰式が示された．認知機能から達成可能なADL・IADL能力の設定が，その逆も含め容易に可能であることを示した．

　This study attempted to identify the hidden relationships between the NM scale score assessment of cognition by observation and estimated functional age levels based on observing activities of daily living (ADL). The subjects included 225 people aged 60 years and older, who attended facilities for the aged, such as day care centers or nursing homes. To analyze the relationship between the NM scale score and functional age level, Pearson's correlation coefficient and simple regression analysis were used. A very high correlation was found between the NM scale score and functional age (γ=0.934, ρ=1.000, p＜0.05). The relationships between the two variables can be simply expressed as follows: 　Functional age (years)=0.846e0.048NM scale score, NM scale score = 4.573+19.903 log_e Functional age (R²=0.963) 　Simple relationships between cognitive level and functional age level were found. That is, cognitive decline and functional age (ADL/IADL function) decline have a high correlation. Both of these easy standard clinical assessments, the NM scale score and ADL/IADL function observation can be used to predict each other. Therefore, occupational therapy goal setting to meet realistic functional levels can be performed easily using cognitive information.