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Table 2 Comparison of demographic information of patients selected for the reliability study versus that of all the patients from the risk factors for TKR revision study

From: Reliability of medical record abstraction by non-physicians for orthopedic research

Categories   Sample patients Other patients
(n = 75) (n = 363)
Age Mean 72.2 73.0
SD 12.6 13.3
Age at primary TKR Mean 62.4 62.9
SD 12.9 12.7
Gender Female 52 (69%) 255 (70%)
Race (%) Asian 1 (1%) 1 (0%)
Black 10 (13%) 46 (13%)
Hispanic 3 (4%) 10 (3%)
White 57 (76%) 293 (81%)
Marital Status (%) Divorced 8 (11%) 31 (9%)
Married 40 (53%) 192 (53%)
Single 13 (17%) 54 (15%)
Widowed 10 (13%) 72 (20%)
Revision? (%) Yes 36 (48%) 111 (31%)
Surgeon (%) Surgeon 1 18 (24%) 69 (19%)
Surgeon 2 14 (19%) 50 (14%)
Surgeon 3 9 (12%) 45 (12%)
Surgeon 4 7 (9%) 47 (13%)
Surgeon 5 7 (9%) 26 (7%)
Other (15) 20 (27%) 126 (35%)