Comparison of helmet minus head cast measurements in head injured and non-head injured children
| Characteristic* | Cases (n=22) | Controls (n=73) | Two tailed p value† |
|---|---|---|---|
| *See accompanying protocol for measurement definitions based on the actual orientation of the helmet on the head. | |||
| † t test for means. | |||
| Helmet minus head cast measurement (mean (SD) in cm and ml) | |||
| Circumference at rim | 4.3 (2.5) | 4.9 (2.4) | 0.30 |
| Anterior-posterior length | 1.0 (1.5) | 1.0 (2.2) | 0.94 |
| Width | 1.7 (0.9) | 1.1 (1.9) | 0.05 |
| Length of anterior-posterior arc | 2.7 (2.0) | 3.1 (2.2) | 0.43 |
| Length of width arc | 2.4 (2.0) | 2.2 (2.7) | 0.83 |
| Depth (helmet rim to top) | 1.0 (1.1) | 0.7 (1.0) | 0.19 |
| Volume (helmet rim to top) | 518 (227) | 458 (282) | 0.36 |