Table 2: Distance from cricoid cartilage with varying experience of the candidate using landmark and ultrasound guided techniques.
| Experience of candidate |
Distance from cricoid in each Subject (mm - negative numbers indicate below the level of the cricoid) |
|||||||
| Landmark | Ultrasound guided | |||||||
| A | B | C | D | A' | B' | C' | D' | |
< 1 year |
-12 -3 -4 0 -31 |
21 0 -6 8 9 |
0 -3 0 0 -2 |
24 0 14 9 -2 |
-5 2 2 4
|
-6 0 2 0
|
-15 0 0 0
|
2 0 -1 0
|
| Median (IQR[range]) |
3.5 (-3-8.3 [-31-24]) mm | 0 (-0.25-2 [-15-4]) mm | ||||||
1-2 years |
-9 -12 -20 -11 |
9 8 3 -6 |
-12 0 4 0 |
17 14 6 9 |
10 6
|
0 0
|
10 2
|
-2 0
|
| Median (IQR[range]) |
9 (-6.8-9.8 [-32-43]) mm | 0.5 (0-2.5 [-10-10]) mm | ||||||
2-5 years |
12 -32 0 0 -15 -12
|
42 7 4 19 16 -9
|
19 4 2 -3 4 8
|
43 -3 0 11 -5 -4
|
-2 1 5 2 5 1 10 4 0 |
-2 0 0 2 0 0 0 0 -2 |
0 0 0 0 6 2 0 0 3 |
-2 0 -2 0 0 1 0 2 0 |
| Median (IQR[range]) |
5.5 (-5.5-4.5 [-15-19]) mm | 0 (0-0.25 [-2-3]) | ||||||
> 5 years |
6 -7 -26 -17 -21 |
0 0 0 4 0 |
-8 -3 -19 0 -11 |
16 -8 0 4 -6 |
3 3 13 5 0 |
0 1 0 0 0 |
-2 0 0 4 4 |
0 0 0 0 1 |
| Median (IQR[range]) |
5 (-17.5-0 [-21-4]) mm | 0 (0-0.25 [-2-4]) mm | ||||||