Table 1.
Baseline Demographics and Clinical Characteristics
| Characteristic | Automatic (n = 72) |
Upon Request (n = 72) |
P value |
|---|---|---|---|
| Sex, % (n) | 0.469 | ||
| Male | 33.3 (24) | 27.8 (20) | |
| Female | 66.7 (48) | 72.2 (52) | |
| Race, % (n) | 0.257 | ||
| Black or African American | 37.5 (27) | 33.3 (24) | |
| White or Caucasian | 54.2 (39) | 63.9 (46) | |
| Other | 8.3 (6) | 2.8 (2) | |
| Health Insurance, % (n) | 0.004 | ||
| Private | 36.1 (27) | 45.8 (33) | |
| Medicare | 18.0 (13) | 9.7 (7) | |
| Medicaid | 5.6 (4) | 22.2 (16) | |
| Medicare Advantage | 34.7 (25) | 22.2 (16) | |
| Other | 5.6 (3) | 0 (0) | |
| Kellgren-Lawrence grade,% (n)a | 0.127 | ||
| 2 | 0 (0) | 1.4 (1) | |
| 3 | 5.6 (4) | 13.9 (10) | |
| 4 | 94.7 (67) | 84.7 (61) | |
| Laterality, % (n) | 0.739 | ||
| Right | 45.8 (33) | 48.6 (35) | |
| Left | 54.2 (39) | 51.4 (37) | |
| Opioid-naive, % (n) | 77.8 (56) | 69.4 (50) | 0.257 |
| Contralateral TKA | 0.228 | ||
| None | 79.2 (57) | 90.3 (65) | |
| Within 6 months | 6.9 (5) | 2.8 (2) | |
| After 6 months | 13.9 (10) | 6.9 (5) | |
| Age (years), mean (SD) | 69.5 (7.9) | 65.2 (9.4) | 0.004 |
| BMI (kg/m2), mean (SD) | 33.9 (6.4) | 32.5 (6.0) | 0.165 |
| Overall deformity (°), mean (SD) | 9.0 (4.9) | 8.9 (5.5) | 0.921 |
| KOOS, mean (SD) | |||
| Pain | 36.3 (20.4) | 33.8 (20.1) | 0.475 |
| Symptoms | 40.6 (21.5) | 37.4 (20.8) | 0.364 |
| ADL | 39.3 (22.4) | 36.8 (21.4) | 0.497 |
| QOL | 19.5 (16.6) | 19.5 (20.0) | 0.980 |
| PROMIS-29, mean (SD) | |||
| Pain Interference | 65.0 (9.1) | 66.0 (6.9) | 0.465 |
| Pain | 7.1 (2.2) | 7.5 (2.3) | 0.285 |
aData were missing for one patient who did not have a preoperative x-ray
ADL Function in daily living, BMI Body mass index, KOOS Knee injury and Osteoarthritis Outcome Score, PROMIS Patient-Reported Outcomes Measurement Information System, QOL Quality of life, SD Standard deviation