Table 2.
Age stratified distribution of covariance after propensity score (PS) matching
| Age 30–49 | Age 50–69 | Age 70–90 | |||||||
|---|---|---|---|---|---|---|---|---|---|
| UKA (N = 743) | HTO (N = 3715) | SMD | UKA (N = 20,162) | HTO (N = 20,162) | SMD | UKA (N = 5280) | HTO (N = 2640) | SMD | |
| Age (mean (sd)) | 46.78 (2.93) | 46.74 (2.87) | 0.016 | 60.05 (4.94) | 60.02 (4.86) | 0.006 | 74.00 (3.46) | 73.98 (3.78) | 0.007 |
| Sex (%) | 0.004 | 0.005 | 0.044 | ||||||
| Female | 569 (76.6) | 2838 (76.4) | 16,365 (81.2) | 16,403 (81.4) | 4240 (80.3) | 2073 (78.5) | |||
| Male | 174 (23.4) | 877 (23.6) | 3797 (18.8) | 3759 (18.6) | 1040 (19.7) | 567 (21.5) | |||
| Hypertension (%) | 249 (33.5) | 1184 (31.9) | 0.035 | 11,164 (55.4) | 11,262 (55.9) | 0.01 | 3804 (72.0) | 1816 (68.8) | 0.071 |
| Hyperlipidemia (%) | 265 (35.7) | 1263 (34.0) | 0.035 | 11,516 (57.1) | 11,496 (57.0) | 0.002 | 3079 (58.3) | 1475 (55.9) | 0.049 |
| Peripheral vascular disease (%) | 120 (16.2) | 541 (14.6) | 0.044 | 5618 (27.9) | 5260 (26.1) | 0.04 | 1984 (37.6) | 950 (36.0) | 0.033 |
| Diabetes without complication (%) | 139 (18.7) | 593 (16.0) | 0.073 | 5927 (29.4) | 5643 (28.0) | 0.031 | 2169 (41.1) | 1017 (38.5) | 0.052 |
| Diabetes with complication (%) | 52 ( 7.0) | 201 ( 5.4) | 0.066 | 2402 (11.9) | 2194 (10.9) | 0.032 | 956 (18.1) | 431 (16.3) | 0.047 |
| Osteoporosis (%) | 62 ( 8.3) | 287 ( 7.7) | 0.023 | 7890 (37.2) | 7713 (36.4) | 0.017 | 3225 (61.1) | 1562 (59.2) | 0.039 |
| Depression (%) | 118 (15.9) | 556 (15.0) | 0.025 | 3635 (18.0) | 3564 (17.7) | 0.009 | 1123 (21.3) | 560 (21.2) | 0.001 |
| Dementia (%) | 3 ( 0.4) | 12 ( 0.3) | 0.013 | 340 ( 1.7) | 345 ( 1.7) | 0.002 | 453 ( 8.6) | 241 ( 9.1) | 0.019 |
| Type of insurance (%) | 0.029 | 0.005 | 0.044 | ||||||
| Health insurance | 689 (92.7) | 3472 (93.5) | 19,507 (96.8) | 19,524 (96.8) | 4964 (94.0) | 2453 (92.9) | |||
| Medical benefits | 54 ( 7.3) | 243 ( 6.5) | 655 ( 3.2) | 638 ( 3.2) | 316 ( 6.0) | 187 ( 7.1) | |||
| City of residence (%) | 0.068 | 0.014 | 0.033 | ||||||
| Over 10milion | 202 (27.2) | 921 (24.8) | 6812 (33.8) | 6848 (34.0) | 1266 (24.0) | 615 (23.3) | |||
| Over 1milion | 160 (21.5) | 767 (20.6) | 4702 (23.3) | 4586 (22.7) | 1354 (25.6) | 652 (24.7) | |||
| Others | 381 (51.3) | 2027 (54.6) | 8648 (42.9) | 8728 (43.3) | 2660 (50.4) | 1373 (52.0) | |||
| Type of hospital (%) | 0.068 | 0.013 | 0.078 | ||||||
| Teaching hospital | 88 (11.8) | 417 (11.2) | 1917 ( 9.5) | 1919 ( 9.5) | 551 (10.4) | 339 (12.8) | |||
| General hospital | 173 (23.3) | 882 (23.7) | 4189 (20.8) | 4135 (20.5) | 1201 (22.7) | 597 (22.6) | |||
| Independent hospital | 463 (62.3) | 2355 (63.4) | 13,319 (66.1) | 13,324 (66.1) | 3248 (61.5) | 1578 (59.8) | |||
| Private clinic | 19 ( 2.6) | 61 ( 1.6) | 737 ( 3.7) | 784 ( 3.9) | 280 ( 5.3) | 126 ( 4.8) | |||
| CCI (%) | 0.045 | 0.012 | 0.067 | ||||||
| 0 | 105 (14.1) | 538 (14.5) | 1278 ( 6.3) | 1277 ( 6.3) | 184 ( 3.5) | 116 ( 4.4) | |||
| 1 | 188 (25.3) | 952 (25.6) | 2999 (14.9) | 2912 (14.4) | 525 ( 9.9) | 277 (10.5) | |||
| 2 | 172 (23.1) | 792 (21.3) | 4118 (20.4) | 4129 (20.5) | 782 (14.8) | 425 (16.1) | |||
| ≥ 3 | 278 (37.4) | 1433 (38.6) | 11,767 (58.4) | 11,844 (58.7) | 3789 (71.8) | 1822 (69.0) | |||