Table 1 Patient characteristics of the two countries (the United Arab Emirates and South Korea) before and after propensity score matching
Before matching | Propensity score matched (1:2) | ||||
|---|---|---|---|---|---|
UAE (n = 2196) | South Korea (n = 14,276) | p-Value | South Korea (n = 4392) | p-Value | |
Age (years) | 48.7 ± 14.1 | 59.9 ± 15.8 | < 0.001 | 49.3 ± 14.0 | 0.998 |
Sex (male %) | 51.5% | 24.8% | < 0.001 | 51.5% | 1.000 |
Body mass index (kg/m2) | 31.2 ± 6.3 | 25.4 ± 3.6 | < 0.001 | 25.1 ± 3.9 | < 0.001 |
Kellgren–Lawrence grade | |||||
0 | 813 (37.0%) | 3389 (23.7%) | 1889 (43.0%) | ||
1 | 420 (19.1%) | 1561 (10.9%) | 679 (15.4%) | ||
2 | 442 (20.1%) | 4216 (29.5%) | 1097 (25.0%) | ||
3 | 384 (17.5%) | 3729 (26.1%) | 561 (12.8%) | ||
4 | 137 (6.2%) | 1380 (9.7%) | 166 (3.8%) | ||
Hip-knee-ankle angle | 175.1 ± 4.2 | 175.9 ± 4.9 | < 0.001 | 177.3 ± 3.9 | < 0.001 |
Medial proximal tibial angle | 86.4 ± 2.9 | 86.9 ± 2.7 | < 0.001 | 86.8 ± 2.6 | < 0.001 |
Lateral distal femoral angle | 87.9 ± 2.8 | 87.6 ± 2.7 | < 0.001 | 87.1 ± 2.6 | < 0.001 |
Joint line convergence angle | 2.9 ± 2.3 | 3.3 ± 3.1 | < 0.001 | 2.4 ± 2.5 | < 0.001 |
Arithmetic HKA | −1.5 ± 4.1 | −0.8 ± 3.7 | < 0.001 | −0.3 ± 3.4 | < 0.001 |
Arithmetic JLO | 174.3 ± 3.9 | 174.5 ± 3.8 | 0.014 | 173.9 ± 3.8 | 0.002 |
CPAK | |||||
1 | 775 (35.3%) | 3662 (25.7%) | 973 (22.2%) | ||
2 | 657 (29.9%) | 4801 (33.6%) | 1709 (38.9%) | ||
3 | 302 (13.8%) | 2303 (16.1%) | 829 (18.9%) | ||
4 | 161 (7.3%) | 1204 (8.4%) | 260 (5.9%) | ||
5 | 183 (8.3%) | 1393 (9.8%) | 364 (8.3%) | ||
6 | 87 (4.0%) | 686 (4.8%) | 195 (4.4%) | ||
7 | 21 (1.0%) | 89 (0.6%) | 19 (0.4%) | ||
8 | 5 (0.2%) | 87 (0.6%) | 25 (0.6%) | ||
9 | 5 (0.2%) | 50 (0.4%) | 18 (0.4%) | ||