With the increasing degree of aging, the proportion of functional decline in the elderly is increasing year by year. Early identification of functional decline is of great significance for realizing healthy aging. Delphi method has been used to construct and verify the function impairment screening tool (FIST) for the elderly.

To evaluate the feasibility, reliability and validity of the function impairment screening tool among community-dwelling older adults.

From March to August 2022, 145 elderly people aged 60 and above from different communities in Beijing were selected to evaluate the feasibility of the scale using the scale acceptance rate, scale qualification rate, and scale completion time; internal consistence reliability was evaluated using Cronbach's α and split-half reliability coefficients; construct validity was evaluated using exploratory factor analysis; and criterion validity was evaluated using Spearman's correlation analysis.

The FIST scale contains 3 dimensions with 16 items: ability of daily living (6 items), ability of domestic life (5 items), and ability of social activities (5 items). The FIST scale acceptance rate and scale qualification rate were both 100%, and the scale completion time was 1-2 min. The Cronbach's α for the FIST total scale was 0.924, and the Cronbach's α for the three dimensions of ability of daily living, ability of domestic life and ability of social activities were 0.588, 0.817 and 0.892. The corrected item-total correlation for the FIST corrected entries ranged from 0.058 to 0.898, and Cronbach's α after deleting an entry ranged from 0.910 to 0.928. The Spearman-Brown coefficient for the total FIST scale was 0.911 and the Guttman split-half coefficient was 0.709; the Spearman-Brown coefficients for the three dimensions of ability of daily living, ability of domestic life and ability of social activities were 0.703, 0.709 and 0.932, and the Guttman split-half coefficients were 0.646, 0.695 and 0.822. The exploratory factor analysis extracted four initial eigenvalues >1 male factors with a cumulative variance contribution of 78.61%, and the factor loadings for each entry ranged from 0.585 to 0.940. The Spearman rank correlation coefficient between the total score of the FIST scale and the Barthel index was 0.876 (P<0.001) .

FIST has high feasibility, reliability and validity and can be used as an assessment tool for physical function impairment in community-dwelling older adults.

随着老龄化程度的加重，老年人功能下降比例逐年增加，及早识别功能下降对于实现健康老龄化具有重要的意义。前期已采用德尔菲法构建并验证老年人功能受损评估量表（FIST）。

在社区老年人中评价FIST的可行性、信度和效度。

2022年3—8月选取145名来自北京市不同社区的≥60岁老年人，采用量表接受率、量表合格率和量表完成时间评价量表可行性，采用Cronbach's α和分半信度系数评价内部一致性信度，采用探索性因子分析评价结构效度，采用Spearman秩相关分析评价效标效度。

FIST包含3个维度，共16个条目：个人生活功能（6个条目）、家庭生活功能（5个条目）和社会活动功能（5个条目）。FIST的量表接受率和量表合格率均为100%，量表完成时间为1~2 min。FIST总量表的Cronbach's α为0.924，个人生活功能、家庭生活功能、社会活动功能3个维度的Cronbach's α分别为0.588、0.817、0.892。FIST校正条目的总相关系数为0.058~0.898，删除某条目后的Cronbach's α为0.910~0.928。FIST总量表的Spearman-Brown系数为0.911，Guttman分半系数为0.709；个人生活功能、家庭生活功能、社会活动功能3个维度的Spearman-Brown系数分别为0.703、0.709、0.932，Guttman分半系数分别为0.646、0.695、0.822。探索性因子分析共提取4个初始特征值>1公因子，累积方差贡献率为78.61%，各条目的因子负荷范围为0.585~0.940。FIST总分与巴氏指数的Spearman秩相关系数为0.876（P<0.001）。

FIST具有较高的可行性、信度和效度，可作为社区老年人躯体功能受损的评估工具。