Table 1 Demographic and baseline characteristics of the matched and nonmatched cohorts
Variables | Not matched | Matched | ||||
|---|---|---|---|---|---|---|
TKA with no SF | TKA after SF | p-Value | TKA with no SF | TKA after SF | p-Value | |
n | 199,273 | 8906 | – | 8887 | 8887 | – |
Age, years (mean ± SD) | 64.9 ± 8.4 | 63.3 ± 8.1 |  < .001 | 63.3 ± 8.1 | 63.3 ± 8.1 | 1 |
Gender (male/female) | 73,185/126,088 | 3335/5571 | 0.17 | 3321/5566 | 3321/5566 | 1 |
Charlson Comorbidity Index | 2.0 ± 2.2 | 1.6 ± 2.0 |  < .001 | 1.6 ± 2.0 | 1.6 ± 2.0 | 1 |
Obesity (n (%)) | 116,954 (58.7%) | 5492 (61.7%) |  < .001 | 5483 (61.7%) | 5483 (61.7%) | 1 |