Table 4.
Baseline characteristics of the unilaterally and bilaterally operated cases in the Charnley (91 and 29) and Duraloc (99 and 21) groups
| Acetabulum | Mean | 95% Confidence interval for mean | |
|---|---|---|---|
| Lower bound | Upper bound | ||
| Charnley | |||
| Baseline HHS | |||
| Unilateral | 46.7 | 43.8 | 49.5 |
| Bilateral | 49.8 | 43.3 | 56.3 |
| Total | 47.4 | 44.8 | 50.0 |
| Age (years) | |||
| Unilateral | 65.5 | 64.0 | 67.0 |
| Bilateral | 63.9 | 60.8 | 67.0 |
| Total | 65.1 | 63.7 | 66.4 |
| BMI (kg/m2) | |||
| Unilateral | 27.4 | 26.4 | 28.3 |
| Bilateral | 25.3 | 24.1 | 26.5 |
| Total | 26.9 | 26.1 | 27.7 |
| Duraloc | |||
| Baseline HHS | |||
| Unilateral | 48.2 | 45.3 | 51.1 |
| Bilateral | 55.2 | 50.0 | 60.3 |
| Total | 49.4 | 46.9 | 52.0 |
| Age (years) | |||
| Unilateral | 66.2 | 64.8 | 67.7 |
| Bilateral | 64.4 | 60.8 | 68.1 |
| Total | 65.9 | 64.6 | 67.3 |
| BMI (kg/m2)a | |||
| Unilateral | 27.1 | 26.3 | 27.9 |
| Bilateral | 24.5 | 23.0 | 26.0 |
| Total | 26.7 | 25.9 | 27.4 |
aSignificant difference as evidenced by nonoverlapping confidence intervals