Mean (SD) values for the spinolaminar angle (SLA) and screw length (SL).
| Cohort | SLA Right (°) | SLA Left (°) | SL Right (mm) | SL Left (mm) |
| Combined | 46.0 (4.0) | 46.1 (4.3) | 31.5 (4.0) | 31.5 (3.8) |
| New Zealand European | 45.3 (4.4) | 45.6 (4.5) | 31.4 (4.2) | 31.3 (4.0) |
| Māori | 47.0 (3.1) | 46.9 (3.8) | 31.8 (3.8) | 31.6 (3.6) |
| P value | 0.006 | 0.027 | 0.146 | 0.296 |
Note: Statistical analysis by Mann-Whitney U test (SLA) and Student t test (SL). Significant P values appear in bold type.