ObjectiveTo explore the applicability of modified four-grade functional activity score in evaluating postoperative mobility ability of patients in thoracic surgery.

MethodsSeventy patients who underwent thoracic surgery were randomly selected as the research objects, and given modified four-grade functional activity score after surgery.The evaluation results were analyzed by item analysis (including item discrimination test and item homogeneity test), reliability analysis and validity analysis.In the item discrimination test, the scores of 70 patients were sorted in descending order.The scores of the first 25% of patients and the last 25% of patients were used as the cut-off points of high value and low value, respectively.The first 25% of patients were set as high score group and the last 25% of patients as low score group, and the differences of each item between the two groups were compared.The homogeneity of items was tested by Pearson correlation coefficient between the scores of each item and the total score of the modified four-grade functional activity score.The reliability of the scale was analyzed using Cronbach's α coefficient.The content validity of the scale was evaluated by content validity index (CVI).

ResultsThe results of item analysis showed that there were significant differences in each item between high score group and low score group (P < 0.01), and the score of each item was positively correlated with the total score of the scale (P < 0.05).The results of reliability analysis indicated that the Cronbach's α coefficient of the scale was 0.934.The results of validity analysis displayed that the CVI of each item at item level and the overall consistency CVI of each item at scale level were 1.0.

ConclusionsThe modified four-grade functional activity score has good applicability in the evaluation of postoperative mobility ability of patients in thoracic surgery.