Table 3 Comparison of baseline data in the two periods
Variables | Group A | Group B | P Value |
|---|---|---|---|
Age (years, mean ± SD) | 65.4 ± 7.9 | 65.9 ± 7.4 | < 0.001 |
Sex | 0.001 | ||
Male, n (%) | 1641 (21.6) | 3759 (23.5) | |
Female, n (%) | 5965 (78.4) | 12,245 (76.5) | |
BMI (kg/m2, n, %) | < 0.001 | ||
≤ 18.5 | 91 (1.2) | 154 (1.0) | |
18.5–23.9 | 2122 (27.9) | 3,673 (23.0) | |
24–27.9 | 3066 (40.3) | 6870 (42.9) | |
≥ 28 | 2327 (30.6) | 5307 (33.1) | |
Kellgren–Lawrence classification | 0.02 | ||
Grade III | 437 (5.7) | 1045 (6.5) | |
Grade IV | 7169 (94.3) | 14,959 (93.5) | |
Comorbidities | < 0.001 | ||
0, n (%) | 2540 (33.4) | 4667 (29.2) | |
1, n (%) | 2787 (36.7) | 5398 (33.7) | |
2, n (%) | 1409 (18.5) | 3177 (19.8) | |
≥ 3, n (%) | 870 (11.4) | 2762 (17.3) | |
Surgical strategies | < 0.001 | ||
TKA, n (%) | 7247 (95.3) | 15,042(94.0) | |
UKA, n (%) | 359 (4.7) | 962 (6.0) | |
Hospital stay (days) | < 0.001 | ||
TKA (median, interquartile range) | 15 (9) | 10 (6) | |
UKA (median, interquartile range) | 10 (6) | 9 (6) | |
Hospitalization costs ($) | < 0.001 | ||
TKA (median, interquartile range) | 8441.6 (1338.2) | 8346.6 (3120.7) | |
UKA (median, interquartile range) | 7659.2 (1838.6) | 7146.6 (2870.5) |