Activity Measure for Post-Acute Care “6-Clicks” for the Prediction of Short-term Clinical Outcomes in Individuals Hospitalized With COVID-19: A Retrospective Cohort Study

OBJECTIVE: To determine the ability of the Activity Measure for Post-Acute Care (AM-PAC) "6-Clicks" assessments of mobility and activity to predict key clinical outcomes in patients hospitalized with coronavirus disease 2019 (COVID-19). DESIGN: Retrospective cohort study. SETTING: An academic health system in the United States consisting of 5 inpatient hospitals. PARTICIPANTS: Adult patients (N=1486) urgently or emergently admitted who tested positive for COVID-19 and had at least 1 AM-PAC assessment. INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURES: Discharge destination, hospital length of stay, in-hospital mortality, and readmission. RESULTS: A total of 1486 admission records were included in the analysis. After controlling for covariates, initial and final mobility (odds ratio, 0.867 and 0.833, respectively) and activity scores (odds ratio, 0.892 and 0.862, respectively) were both independent predictors of discharge destination with a high accuracy of prediction (area under the curve [AUC]=0.819-0.847). Using a threshold score of 17.5, sensitivity ranged from 0.72-0.79, whereas specificity ranged from 0.74-0.83. Both initial AM-PAC mobility and activity scores were independent predictors of mortality (odds ratio, 0.885 and 0.877, respectively). Initial mobility, but not activity, scores were predictive of prolonged length of stay (odds ratio, 0.957 and 0.980, respectively). However, the accuracy of prediction for both outcomes was weak (AUC=0.659-0.679). AM-PAC scores did not predict rehospitalization. CONCLUSIONS: Functional status as measured by the AM-PAC “6-Clicks” mobility and activity scores are independent predictors of key clinical outcomes individual hospitalized with COVID-19.