Table 2.
Preoperative Patient Demographics
| Variable | Overall (n=100) | Early period (n=50) | Late period (n=50) | p-valuea) |
|---|---|---|---|---|
| Age (yr) | 59.6 (5.9) | 59.4 (6.0) | 59.8 (5.9) | 0.688 |
| Body mass index (kg/m2) | 26.9 (3.1) | 26.6 (2.8) | 27.2 (3.3) | 0.330 |
| Gender (female/male) | 87/13 | 41/9 | 46/4 | 0.137 |
| Preop posterior tibial slope (°) | 9.2 (2.9) | 9.6 (2.2) | 8.8 (3.4) | 0.164 |
| Preop mechanical HKA angle (°) | 5.1 (3.0) | 4.8 (2.9) | 5.5 (3.1) | 0.205 |
| Correction angle (°) | 9.8 (3.6) | 9.3 (3.3) | 10.3 (3.9) | 0.149 |
Values are presented as mean (standard deviation).
Preop: preoperative, HKA: hip-knee-ankle.
a)
Student t-test was performed for the comparison of patient demographics between the periods.