Under the Participants heading in the Methods section, the American College of Rheumatology criteria for osteoarthritis should include morning stiffness of up to 60 minutes, not longer than 60 minutes as mentioned in this study.
In Table 2. Primary and Secondary Outcome Measures at the 3- and 12-Month Follow-up. Under the column heading Secondary outcomes, Usual Care, 3 mo, a superscript 1 beside (22.7) in the 2nd set of numbers across from WOMAC pain, Mean (SD), is in error and should be ignored.