Table 1.
Patient baseline characteristics of high tibial osteotomy by age.
| HTO | |||||
|---|---|---|---|---|---|
| < 60 | 60–65 | > 65 | P-value | SMD | |
| (N = 41,112) | (N = 13,895) | (N = 6138) | |||
| Age (mean (sd)) | 52.62 (5.38) | 62.10 (1.66) | 70.13 (4.24) | < 0.001 | 2.829 |
| Sex (%) | < 0.001 | 0.052 | |||
| Female | 10,948 (26.6) | 3230 (23.2) | 1431 (23.3) | ||
| Male | 30,164 (73.4) | 10,665 (76.8) | 4707 (76.7) | ||
| Hypertension (%) | 15,858 (38.6) | 7465 (53.7) | 3981 (64.9) | < 0.001 | 0.360 |
| Hyperlipidemia (%) | 18,933 (46.1) | 8518 (61.3) | 3677 (59.9) | < 0.001 | 0.206 |
| Peripheral vascular disease (%) | 7898 (19.2) | 3915 (28.2) | 2010 (32.7) | < 0.001 | 0.208 |
| Diabetes_without complication (%) | 8120 (19.8) | 4096 (29.5) | 2230 (36.3) | < 0.001 | 0.250 |
| Diabetes_with complication (%) | 2898 (7.0) | 1579 (11.4) | 930 (15.2) | < 0.001 | 0.174 |
| Depression (%) | 6063 (14.7) | 2631 (18.9) | 1277 (20.8) | < 0.001 | 0.106 |
| Dementia (%) | 252 (0.6) | 248 (1.8) | 373 (6.1) | < 0.001 | 0.213 |
| Type of insurance (%) | 0.68 | 0.083 | |||
| Health insurance | 39,522 (96.1) | 13,563 (97.6) | 5852 (95.3) | ||
| Medical benefits | 1590 (3.9) | 332 (2.4) | 286 (4.7) | ||
| City of residence (%) | < 0.001 | 0.085 | |||
| Over 10milion | 11,345 (27.6) | 4099 (29.5) | 1581 (25.8) | ||
| Over 1milion | 11,603 (28.2) | 3736 (26.9) | 1550 (25.3) | ||
| Others | 18,164 (44.2) | 6060 (43.6) | 3007 (49.0) | ||
| Type of hospital (%) | < 0.001 | 0.091 | |||
| Teaching hospital | 4734 (11.5) | 1277 (9.2) | 645 (10.5) | ||
| General hospital | 7369 (17.9) | 2336 (16.8) | 1229 (20.0) | ||
| Independent hospital | 27,353 (66.5) | 9603 (69.1) | 3956 (64.5) | ||
| Private clinic | 1656 (4.0) | 679 (4.9) | 308 (5.0) | ||
| CCI (%) | < 0.001 | 0.329 | |||
| 0 | 4617 (11.2) | 733 (5.3) | 271 (4.4) | ||
| 1 | 8530 (20.7) | 1760 (12.7) | 663 (10.8) | ||
| 2 | 9465 (23.0) | 2835 (20.4) | 1069 (17.4) | ||
| ≥ 3 | 18,500 (45.0) | 8567 (61.7) | 4135 (67.4) | ||
| Year (%) | < 0.001 | 0.183 | |||
| 2008 | 1143 (2.8) | 236 (1.7) | 128 (2.1) | ||
| 2009 | 1302 (3.2) | 236 (1.7) | 164 (2.7) | ||
| 2010 | 1591 (3.9) | 290 (2.1) | 172 (2.8) | ||
| 2011 | 2403 (5.8) | 577 (4.2) | 308 (5.0) | ||
| 2012 | 3192 (7.8) | 807 (5.8) | 396 (6.5) | ||
| 2013 | 4125 (10.0) | 1204 (8.7) | 579 (9.4) | ||
| 2014 | 4253 (10.3) | 1274 (9.2) | 575 (9.4) | ||
| 2015 | 5153 (12.5) | 1626 (11.7) | 750 (12.2) | ||
| 2016 | 6039 (14.7) | 2225 (16.0) | 1004 (16.4) | ||
| 2017 | 5952 (14.5) | 2580 (18.6) | 1008 (16.4) | ||
| 2018 | 5959 (14.5) | 2840 (20.4) | 1054 (17.2) | ||
HTO high tibial osteotomy, SMD standardised mean difference, CCI Charlson comorbidity index.
*CCI: Myocardial infarction, Congestive heart failure, Peripheral vascular disease, Cerebrovascular disease, Dementia, Chronic pulmonary disease, Connective tissue disease, Peptic ulcer disease, Mild liver disease, Moderate or severe liver disease (3), Diabetes without complications, Diabetes with complications (2), Paraplegia and hemiplegia (2), Renal disease (2), Cancer (2), Metastatic carcinoma (6), AIDS/HIV (6).