Table 1.
Patient characteristics, surgical characteristics, and preoperative patient-reported outcomes, n (%)
|
Characteristics
|
Respondents, n = 2063
|
Nonrespondents, n = 367
|
P value
|
| Patient characteristics | |||
| Age in year, median (IQR) | 65.80 (7.19) | 65.13 (8.39) | 0.222 |
| BMI in kg/m2, median (IQR) | 27.77 (3.44) | 27.84 (3.31) | 0.516 |
| Sex, male | 973 (47.2) | 190 (51.8) | 0.112 |
| ASA, I | 799 (38.7) | 143 (39.0) | 0.954 |
| Smoking status, yes | 156 (7.6) | 42 (11.4) | 0.017a |
| Alcohol consumption, yes | 1499 (72.7) | 244 (66.5) | 0.020a |
| Previous knee surgery, yes | 986 (47.8) | 173 (47.1) | 0.821 |
| Charnley classification | 0.113 | ||
| A Unilateral knee arthritis | 972 (47.1) | 160 (43.6) | |
| B1 Unilateral knee TKA | 482 (23.4) | 78 (21.3) | |
| B2 Bilateral TKA | 412 (20.0) | 94 (25.6) | |
| C more joints affected | 197 (9.5) | 34 (9.3) | |
| Surgical characteristics | |||
| Diagnosis, osteoarthritis | 2021 (98.0) | 355 (96.7) | 0.175 |
| Anesthesia technique, spinal | 2043 (99.0) | 362 (98.6) | 0.763 |
| Operative duration in min, median (IQR) | 40.77 (9.51) | 41.04 (9.83) | 0.551 |
| Complication, yes | 62 (3.0) | 18 (4.9) | 0.078 |
| Preoperative PROs | |||
| NRS pain score at rest, median (IQR) | 4.92 (2.38) | 5.23 (2.43) | 0.021a |
| NRS pain score during activity, median (IQR) | 7.18 (1.88) | 7.18 (2.00) | 0.558 |
| KOOS-PS score, median (IQR) | 47.23 (12.74) | 48.98 (14.19) | 0.084 |
| EQVAS score, median (IQR) | 72.91 (18.65) | 72.96 (19.03) | 0.906 |
| EQ-5D descriptive system score, median (IQR) | 0.590 (0.250) | 0.551 (0.273) | 0.013a |
| OKS, median (IQR) | 24.92 (7.16) | 23.83 (7.64) | 0.042a |
a
P < 0.05.
ASA: American Society of Anesthesiologists score; BMI: Body mass index; EQ-5D descriptive system: EuroQol five dimensions descriptive system; EQ VAS: EuroQol five dimensions Visual Analogue Scale; KOOS-PS: Knee Injury and Osteoarthritis Outcome Score - Physical Function Short Form; NRS: Numeric rating scale; OKS: Oxford knee score; PRO: Patient-reported outcomes; TKA: Total knee arthroplasty; IQR: Interquartile range.