Table 1.

Flowchart showing losses to followup

Subjects followed from baseline to 30-month visit (number)	Reason for loss to followup or exclusion from analysis
3026	Recruited at baseline
−3	Rheumatoid arthritis
−20	Baseline WOMAC function missing
−29	Death before 30-month visit
−5	Withdrew consent by 30-month visit
−23	Telephone interview not done for any reason at 30-month visit
2946	Used for 0- to 30-month period

Subjects followed from 30- to 60-month visit (number)
2966	Non-RA subjects with 30-month visit telephone interview
−43	Bilateral TKA before 30-month visit
−270	WOMAC function missing at 30-month visit
−23	30-month visit knee radiographs not done or radiograph reading excluded as a result of osteonecrosis, etc
−48	Death before 60-month visit
−23	Withdrew consent by 60-month visit
−5	Discontinued by 60-month visit
−59	Telephone interview not done for any reason at 60-month visit
2495	Used for 30- to 60-month period

RA = rheumatoid arthritis.