Mean values for the outer diameter (OD), inner diameter (ID), spinolaminar angle (SLA), and screw length (SL) for subgroups according to ethnicity and gender.
| Measure | NZE Men | NZE Women | Māori Men | Māori Women | P |
| Right OD (mm) | 6.5 | 6.3a | 7.1a , b | 6.2b | 0.012 |
| Left OD (mm) | 6.8 | 6.6a | 7.3a , b | 6.4 a, b | 0.008 |
| Right ID (mm) | 3.5 | 3.3a | 3.9a , b | 3.2b | 0.034 |
| Left ID (mm) | 3.8 | 3.5a | 4.3a , b | 3.3b | <0.001 |
| Right SLA (°) | 44.8c | 46.1 | 47.3c | 46.4 | 0.003 |
| Left SLA (°) | 45.0c | 46.5 | 46.8c | 47.1 | 0.045 |
| Right SL (mm) | 32.2d , e | 30.0a , e | 32.9a , b | 29.7b , d | <0.001 |
| Left SL (mm) | 32.3e | 29.7a , e | 32.4a | 30.1 | <0.001 |
Abbreviation: NZE, New Zealand European.
Note: Group comparisons were performed using a 1-way analysis of variance. Significant between-group differences are noted by symbols assigned as follows. Significant P values appear in bold type.
↵a NZE women: Māori men
↵b Māori men: Māori women
↵c NZE men: Māori men
↵d NZE men: Māori women
↵e NZE men: NZE women