Table 1.
Characteristics of Primary TKA patients
| All Patients (N = 426551) |
No Complication (N = 415184) |
In-hospital Complication (N = 6202) |
90-day Readmission Complication (N = 5165) |
P-value* | |
|---|---|---|---|---|---|
| Age, mean (SD) | 74.5 (6.0) | 74.5 (6.0) | 74.9 (6.0) | 75.1 (6.1) | <0.0001 |
| Sex, women (%) | 274601 (64.4) | 267708(64.5) | 3840 (61.9) | 3053 (59.1) | 0.0001 |
| Race, number (%) | |||||
| White | 388113 (91.0) | 378027 (91.1) | 5493 (88.6) | 4593 (88.9) | <0.0001 |
| Black | 22471 (5.3) | 21678 (5.2) | 428 (6.9) | 365 (7.1) | <0.0001 |
| Other | 14818 (3.5) | 14355 (3.5) | 264 (4.3) | 199 (3.9) | 0.0010 |
| Missing | 1149 (0.3) | 1124 (0.3) | 17 (0.3) | 8 (0.2) | 0.2790 |
| Comorbidity, number (%) |
|||||
| Diabetes | 91400 (21.4) | 89003 (21.4) | 1245 (20.1) | 1152 (22.3) | 0.0104 |
| CHF | 16322 (3.8) | 15643 (3.8) | 379 (6.1) | 300 (5.8) | <0.0001 |
| Obesity | 47686 (11.2) | 46445 (11.2) | 565 (9.1) | 676 (13.1) | <0.0001 |
| Renal failure | 16509 (3.9) | 16030 (3.9) | 242 (3.9) | 237 (4.6) | 0.0263 |
| Number of comorbid conditions, mean (SD) |
2.1 (1.4) | 2.1 (1.4) | 2.6 (1.4) | 2.3 (1.5) | <0.0001 |
*
P-values compare differences among no-complication, in-hospital complication, and 90-day readmission complication groups
*
Patients who died in-hospital would not contribute to the 90-day readmission complication group numerator or denominator (575 patients died in-hospital)
*
Patients who experienced both an in-hospital and readmission complication were counted only in the in-hospital complication group.