Objective: This study aimed to examine the dietary behavior and knowledge that influence longitudinal changes in vegetable intake among remote island residents using existing health and nutrition survey data.
Methods: Data from health and nutrition surveys conducted in Nishinoshima town, a remote island in Shimane Prefecture, Japan, during the formulation of a health promotion plan (2014) and mid-term evaluation (2021) were used. The analysis included 135 men and women in their 20s~70s who responded to both surveys. Paired statistical tests were used to compare the characteristics and vegetable intake of the participants at two time points. Multiple regression analysis was used to examine the factors influencing the changes in vegetable intake between 2014 and 2021.
Results: Between 2014 and 2021, a significant reduction in vegetable intake was observed among men. Multiple regression analysis showed that change in \"family composition (from living together to living alone)\" was significantly associated with decreased vegetable intake, and increased \"frequency of a well-balanced diet (combination of staple food, main, and side dishes)\" was significantly associated with increased vegetable intake.
Conclusions: This study suggested that individual dietary behaviors and socioeconomic factors influenced changes in vegetable intake.
"},{"@language":"ja","@value":"【目的】離島住民を対象に，個別データの連結が可能な既存の健康・栄養調査データの活用により，野菜摂取量の変化に影響を及ぼす要因を食行動や食知識から検討することを目的とした。
【方法】島根県隠岐郡西ノ島町の，健康増進計画策定時（2014年）ならびに中間評価時（2021年）の健康・栄養調査データを用い，両調査ともに有効な回答の得られた20～70歳代の男女135名を解析対象とした。2時点における対象者の属性，野菜摂取量の比較には対応のある検定を用い，野菜摂取変化量（2021年から2014年の野菜摂取量を差し引いたもの）を従属変数，食行動，食知識，社会経済的要因，野菜栽培，定期健診に関する項目を独立変数とした重回帰分析を行い要因の分析を行った。
【結果】2時点の比較において，男性で野菜摂取量の有意な減少が認められた。重回帰分析によって，「家族構成」の同居から独居への変化が野菜摂取量の減少に有意に関連し，「主食・主菜・副菜をそろえた食事摂取頻度」の増加が野菜摂取量の増加に有意に関連することが認められた。
【結論】健康・栄養調査データを活用した縦断的研究により，個人の食行動，社会経済的要因が野菜摂取量の変化に影響を及ぼすことが示唆された。
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