Descriptive statistics for the measurements defining the distances between the axillary nerve and several reference points as well as its thicknesses at various points. All measurements were given in millimeters.
| Measurement | Trimester | n | Mean ± SD | Minimum | Maximum | *P-value |
|---|---|---|---|---|---|---|
| Distance between the coracoid tip and the diverging point of the | 2 | 38 | 8.85 ± 3.99 | 4.13 | 21.30 | 0.0001 |
| axillary nerve from the posterior cord | 3 | 32 | 15.77 ± 4.32 | 9.40 | 27.80 | |
| Thickness of the axillary nerve at the diverging point from the | 2 | 38 | 1.05 ± 0.43 | 0.33 | 2.01 | 0.012 |
| posterior cord | 3 | 32 | 1.32 ± 0.45 | 0.64 | 2.33 | |
| Distance from the anterior edge of the acromion to the axillary | 2 | 38 | 10.52 ± 2.24 | 5.80 | 17.10 | 0.0001 |
| nerve through anterior raphe dissection of the deltoid muscle | 3 | 32 | 13.68 ± 2.85 | 9.10 | 19.20 | |
| Distance from the posterior edge of the acromion to the axillary | 2 | 38 | 11.59 ± 2.44 | 6.39 | 16.97 | 0.0001 |
| nerve through posterior raphe dissection of the deltoid muscle | 3 | 32 | 15.40 ± 3.07 | 10.04 | 20.87 | |
| Length of the axillary nerve from the beginning to the point where | 2 | 38 | 11.94 ± 3.08 | 6.21 | 17.60 | 0.003 |
| it gives the first branch | 3 | 32 | 14.62 ± 4.05 | 7.89 | 23.50 | |
| Shortest distance between the axillary nerve and the glenoid labrum | 2 | 38 | 2.30 ± 0.65 | 1.04 | 3.55 | 0.001 |
| 3 | 32 | 2.89 ± 0.81 | 1.19 | 5.05 |
↵* P-value significance value for comparison of trimesters by using Student’s-t test