Table 2.
Patients’ characteristics in each risk group
| Age | Height | Weight | D | W | DIV | Overlap | ||
|---|---|---|---|---|---|---|---|---|
| Group | n | Months | cm | kg | mm | mm | mm | n |
| H | 7 | 4.4 ± 4.5 (4.0) | 55.9 ± 12.5 (65.6) | 4.4 ± 2.0 (6.0) | 15.2 ± 2.3 (15.5) | 3.3 ± 1.4 (2.8) | 3.9 ± 1.3 (3.8) | 5 |
| M | 33 | 20.2 ± 32.0 (11.5) | 73.9 ± 24.5 (72.1) | 8.8 ± 7.8 (8.2) | 14.8 ± 3.6 (14.8) | 2.9 ± 1.0 (2.9) | 4.5 ± 1.8 (4.6) | 14 |
| L | 15 | 28.6 ± 44.2 (5.0) | 75.9 ± 32.3 (64.2) | 11.2 ± 12.7 (5.6) | 15.8 ± 3.1 (16.2) | 2.3 ± 0.8 (2.4) | 5.1 ± 2.2 (4.9) | 3 |
| P value | 0.310 | 0.208 | 0.261 | 0.002 | 0.107 | 0.025 | 0.065 | |
| H vs L | P > 0.05 | P > 0.05 | ||||||
| H vs M | P > 0.05 | P > 0.05 | ||||||
| L vs M | P < 0.05 | P < 0.05 |
Data are the mean ± sd (median). No significant differences were noted in the results among the three groups in the patients' ages, heights, weights, W, and overlap. Significant differences between the D and DIV values of the L and M groups were noted. D, depth from the skin to VA; W, width of the VA; DIV, distance from the IJV to VA; H, high risk; M, moderate risk; L, low risk overlap: between the IJV and VA; VA, vertebral artery; IJV, internal jugular vein.