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Table 1 Clinical and demographic characteristics of patients

From: Income and patient-reported outcomes (PROs) after primary total knee arthroplasty

  Primary TKA, na (%) unless specified otherwise
  2 years (n = 7, 139) 5 years, (n = 4, 234)
Men/women 3, 162 (44.3%)/3, 977 (55.7%) 1903 (44.9%)/2, 331 (55.1%)
Age, mean ± SD 68.4 ± 10.0 68.4 ± 9.6
Age groups, n (%):   
≤ 60 years 1, 313 (18.4%) 745 (17.6%)
> 60 to 70 years 2, 531 (35.5%) 1, 576 (37.2%)
> 70 to 80 years 2, 734 (38.3%) 1, 617 (38.2%)
> 80 years 561 (7.9%) 296 (7.0%)
Body mass index, kg/m2:   
< 25 934 (13.1%) 566 (13.4)%
25 to 29.9 2, 479 (34.7%) 1, 525 (36.0%)
30 to 34.9 2, 092 (29.3%) 1, 250 (29.5%)
35 to 39.9 976 (13.7%) 573 (13.5%)
≥ 40 605 (8.5%) 303 (7.2%)
ASA score:   
Class I to II 4, 115 (57.6%) 2, 467 (58.3%)
Class III to IV 3, 006 (42.1%) 1, 741 (41.1%)
Deyo-Charlson Index, mean ± SD 1.2 ± 1.9 1.1 ± 1.9
Key Deyo-Charlson comorbidities:   
Myocardial infarction 341 (4.8%) 202 (4.8%)
Peripheral vascular disease 370 (5.2%) 190 (4.5%)
Renal disease 397 (5.6%) 175 (4.1%)
Chronic obstructive pulmonary disease 762 (10.7%) 408 (9.6%)
Diabetes 669 (9.4%) 349 (8.2%)
Connective tissue disease 520 (7.3%) 352 (8.3%)
Anxiety 465 (6.5%) 220 (5.2%)
Depression 741 (10.4%) 334 (7.9%)
Distance from medical center:   
0 to 100 miles 3, 669 (51.4%) 2, 080 (49.1%)
> 100 to 500 miles 2, 731 (38.3%) 1, 653 (39.0%)
> 500 miles 541 (7.6%) 327 (7.7%)
Diagnosis:   
Inflammatory arthritis 256 (3.6%) 189 (4.5%)
Osteoarthritis 6, 710 (94.0%) 3, 922 (92.6%)
Other 172 (2.4%) 123 (2.9%)
  1. aMissing values for 2-year cohort: 27 were missing body mass index (BMI), 18 were missing American Society of Anesthesiologists (ASA) class, 3 were missing Charlson Index scores, 198 were missing the distance variable, 1 was missing operative diagnosis. Missing values for 5-year cohort: 17 were missing BMI, 26 were missing ASA class, 174 were missing the distance variable, 23 were missing operative diagnosis.