Percentage of laminae in which lamina screw placement was considered feasible in New Zealand European and Māori patients.
| Cohort | OD Right >5.5 mm | OD Left >5.5 mm | ID Right >3.5 mm | ID Left >3.5 mm |
| New Zealand European | 77% | 80% | 49% | 50% |
| Māori | 86% | 89% | 57% | 71% |
| P value | 0.136 | 0.140 | 0.340 | 0.007 |
Abbreviations: ID, inner diameter; OD, outer diameter.
Note: Proportions were compared using the z test for proportions. Significant P values appear in bold type.