Table 3.
Characteristics of the cohort
| Characteristic | Total | College or above | Non-college | P-Value |
|---|---|---|---|---|
| Number of patients | 3970 (100%) | 2438 (61%) | 1532 (39%) | |
| Age at surgery (years), mean (SD) | 67.13(9.58) | 66.86 (9.35) | 67.55 (9.92) | 0.014 |
| Female, n (%) | 2437 (61.39%) | 1397 (57.30%) |
1040 (67.89%) |
<0.0001 |
| BMI (kg/m2), mean (SD) | 29.99 (5.92) | 29.29 (5.53) | 31.10 (6.34) | <0.0001 |
| Hispanic, n (%) | 81 (2.30%) | 39 (1.78%) |
42 (3.15%) |
0.008 |
| One or more comorbidities, n (%) | 1120 (28.21%) | 634 (26.00%) | 486 (31.72%) | <0.0001 |
| White, n (%) | 3780 (95.21%) |
2352 (96.47%) |
1428 (93.21%) |
<0.0001 |
|
Insurance payer, n (%) Medicaid Medicare Other insurance |
58 (1.46%) 2492 (62.77%) 1420 (35.77%) |
13 (0.53%) 1499 (61.48%) 926 (37.98%) |
45 (2.94%) 993 (64.82%) 494 (32.25%) |
<0.0001 |
|
ASA Class, n (%) Missing I-II III-IV |
2 3162 (79.69%) 806 (20.31%) |
1 1963 (80.55%) 474 (19.45%) |
1 1199 (78.31%) 332 (21.69%) |
0.09 |
|
Hospital for Special Surgery Expectations Score, mean (SD) |
78.50 (17.99) | 79.03 (17.56) | 77.59 (18.68) | 0.087 |
| WOMAC pain at baseline, mean (SD) | 54.32 (17.65) | 57.23 (16.92) | 49.63 (17.81) | <0.0001 |
| WOMAC pain at 2 Years, mean (SD) | 87.42 (16.05) | 89.21 (14.01) | 84.54 (18.52) | <0.0001 |
| Delta WOMAC pain, mean (SD) | 33.13 (20.30) | 32.08 (19.36) | 34.85 (21.65) | <0.0001 |
| WOMAC function at baseline, mean (SD) | 53.45 (17.76) | 56.95 (17.07) | 47.85 (17.39) | <0.0001 |
| WOMAC function at 2 Years, mean (SD) | 85.08 (16.49) | 86.94 (14.52) | 82.09 (18.86) | <0.0001 |
| Delta WOMAC function, mean (SD) | 31.58 (19.73) | 30.00 (18.87) | 34.11 (20.80) | <0.0001 |
|
Census Tract Percent Below Poverty Level, n (%) <10% 10%-20% >20% |
3174 (79.97%) 594 (14.97%) 201 (5.06%) |
2021 (82.93%) 318 (13.05%) 98 (4.02%) |
1153 (75.26%) 276 (18.02%) 103 (6.72%) |
<0.0001 |
|
Census Tract Percent Below Poverty Level, n (%) Low poverty <15% Middle to high poverty >=15% |
3174 (79.97%) 594 (14.97%) |
2247 (92.20%) 190 (7.80%) |
1346 (87.86%) 186 (12.14%) |
<0.0001 |
|
Census Tract Percent of 25 or older with Bachelor’s degree or above, n (%) Low Education <15% Middle Education 15%−39.9% High Education >=40% |
81 (2.04%) 1194 (30.08%) 2695 (67.88%) |
18 (0.74%) 537 (22.03%) 1883 (77.24%) |
63 (4.11%) 657 (42.89%) 812 (53.00%) |
<0.0001 |
*
BMI=body mass index; ASA=American Society of Anesthesiologists; HSS=Hospital for Special Surgery; WOMAC=Western Ontario and McMaster Universities Osteoarthritis Index.