↵^a Data are reported as percentages unless otherwise indicated. CCI=Charlson Comorbidity Index, NSAIDs=nonsteroidal anti-inflammatory drugs.

^b The use of physical therapy was categorized on the basis of its position in the patient's care process as follows: physical therapy entry=physical therapy was the setting for the entry visit, physical therapy early=physical therapy was not the entry setting but was received within 14 days of entry, physical therapy delayed=physical therapy was not the entry setting and was received more than 14 days after entry.