Table 1.
Patient baseline characteristics before and after propensity score matching
| All patient | Matched patient | ||||||
|---|---|---|---|---|---|---|---|
| UKA (N = 29,560) | HTO (N = 61,145) | p value | SMD | UKA (N = 23,563) | HTO (N = 23,563) | SMD | |
| Age (mean (sd)) | 63.81 (8.39) | 56.53 (7.60) | < 0.001 | 0.909 | 61.24 (7.06) | 61.20 (6.93) | 0.006 |
| Sex (%) | < 0.001 | 0.178 | 0.023 | ||||
| Female | 24,184 (81.8) | 45,536 (74.5) | 18,785 (79.7) | 19,003 (80.6) | |||
| Male | 5376 (18.2) | 15,609 (25.5) | 4778 (20.3) | 4560 (19.4) | |||
| Hypertension (%) | 18,073 (61.1) | 27,304 (44.7) | < 0.001 | 0.335 | 13,054 (55.4) | 13,293 (56.4) | 0.02 |
| Hyperlipidemia (%) | 17,082 (57.8) | 31,128 (50.9) | < 0.001 | 0.138 | 13,054 (55.4) | 13,349 (56.7) | 0.025 |
| Peripheral vascular disease (%) | 9147 (30.9) | 13,823 (22.6) | < 0.001 | 0.189 | 6615 (28.1) | 6545 (27.8) | 0.007 |
| Diabetes_with out complication (%) | 9768 (33.0) | 14,446 (23.6) | < 0.001 | 0.21 | 7003 (29.7) | 6816 (28.9) | 0.017 |
| Diabetes_with complication (%) | 4066 (13.8) | 5407 ( 8.8) | < 0.001 | 0.156 | 2833 (11.4) | 2680 (11.4) | 0.02 |
| Osteoporosis (%) | 12,812 (43.3) | 15,987 (26.1) | < 0.001 | 0.367 | 4314 (18.3) | 4279 (18.2) | 0.004 |
| Depression (%) | 5694 (19.3) | 9971 (16.3) | < 0.001 | 0.077 | 8790 (37.3) | 8864 (37.6) | 0.006 |
| Dementia (%) | 1116 ( 3.8) | 873 ( 1.4) | < 0.001 | 0.148 | 548 (2.3) | 574 (2.4) | 0.007 |
| Type of insurance (%) | 0.206 | 0.009 | 0.017 | ||||
| Health insurance | 28,442 (96.2) | 58,937 (96.4) | 22,645 (96.1) | 22,721 (96.4) | |||
| Medical benefits | 1118 (3.8) | 2208 (3.6) | 918 ( 3.9) | 842 ( 3.6) | |||
| City of residence (%) | < 0.001 | 0.170 | 0.017 | ||||
| Over 10milion | 10,452 (35.4) | 17,025 (27.8) | 7726 (32.8) | 7579 (32.2) | |||
| Over 1milion | 6733 (22.8) | 16,889 (27.6) | 5617 (23.8) | 5574 (23.7) | |||
| Others | 12,375 (41.9) | 27,231 (44.5) | 10,220 (43.4) | 10,410 (44.2) | |||
| Type of hospital (%) | < 0.001 | 0.105 | 0.025 | ||||
| Teaching hospital | 2757 (9.3) | 6656 (10.9) | 2307 ( 9.8) | 2222 ( 9.4) | |||
| General hospital | 6427 (21.7) | 10,934 (17.9) | 5005 (21.2) | 4826 (20.5) | |||
| Independent hospital | 19,225 (65.0) | 40,912 (66.9) | 15,278 (64.8) | 15,541 (66.0) | |||
| Private clinic | 1151 (3.9) | 2643 (4.3) | 973 ( 4.1) | 974 ( 4.1) | |||
| CCI (%) | < 0.001 | 0.246 | 0.036 | ||||
| 0 | 1636 (5.5) | 5621 (9.2) | 1500 ( 6.4) | 1439 ( 6.1) | |||
| 1 | 3935 (13.3) | 10,953 (17.9) | 3586 (15.2) | 3383 (14.4) | |||
| 2 | 5538 (18.7) | 13,369 (21.9) | 4794 (20.3) | 4649 (19.7) | |||
| ≥ 3 | 18,451 (62.4) | 31,202 (51.0) | 13,683 (58.1) | 14,092 (59.8) | |||
UKA unicompartmental knee arthroplasty, HTO high tibial osteotomy, SMD standardised mean difference, CCI Charlson comorbidity index