Table 4.

Variable importance of features associated with postacute sequelae of COVID-19 diagnosis by the temporal window. Ranked by the mean absolute Shapley value of the top 10 features in each category. Model created using electronic health record data from a sample of patients included in the National COVID Cohort Collaborative during the COVID-19 pandemic. The temporal windows included baseline (before t – 37), pre–COVID-19 (t – 37 to t – 7), acute COVID-19 (t – 7 to t + 14), and post–COVID-19 (t + 14 to t + 28) periods, with t being the index COVID-19 date.

Temporal window	Absolute Shapley value of top 10 features, mean (SD)
Baseline	0.026 (0.020)
Acute COVID-19	0.016 (0.015)
Post–COVID-19	0.008 (0.010)
Pre–COVID-19	0.006 (0.003)