Table 2 Intubation Difficulty Score (IDS). Used to quantify difficulty of intubation [17]
IDS parameter | Score |
|---|---|
Number of attempts > 1 | N1 |
Number of operators > 1 | N2 |
Number of alternative techniques | N3 |
Cormack and Lehane grade minus 1 | N4 |
Total IDS = sum of scores |  |