Table 1 Factors potentially influencing endotracheal intubation success probability
All attempts (n = 1200) | Univariable analysis* | Multivariable analysis*** | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Success** probability | 95 % CI limits | Success probability for novices 1 | 95 % CI limits | |||||||||
Number of attempts, n | Failure attempts, n (%) | Lower | Upper | Odds ratio | p value | Odds ratio | Lower | Upper | p value | |||
ETI device | 1200 | 125 (10.4) | ||||||||||
DLM | 600 | 111 (18.5) | 0.81 | 0.67 | 0.90 | 1.00 | <0.0001 | 0.69 | – | 0.005 | 1.00 | <0.0001 |
AWS | 600 | 14 (2.3) | 0.98 | 0.94 | 0.99 | 9.57 | 0.96 | – | 0.09 | 1.00 | ||
Operator sub-group (device order) | ||||||||||||
Experts (DLM then AWS) | 400 | 10 (2.5) | 0.97 | 0.94 | 0.99 | 8.04 | 0.0002 | – | 9.06 | 4.17 | 19.71 | <0.0001 |
Novices 1 (DLM then AWS) | 400 | 70 (17.5) | 0.83 | 0.72 | 0.90 | 1.00 | – | – | 1.00 | – | – | – |
Novices 2 (AWS then DLM) | 400 | 45 (11.3) | 0.89 | 0.81 | 0.94 | 1.68 | 0.03 | – | 1.80 | 1.12 | 2.89 | 0.02 |
Attempt number in the series of 10 attempts | ||||||||||||
1 | 120 | 17 (14.2) | 0.87 | 0.73 | 0.94 | 1.00 | Reference | – | – | – | – | – |
2 | 120 | 18 (15) | 0.85 | 0.71 | 0.93 | 0.89 | 0.70 | – | – | – | – | – |
3 | 120 | 12 (10) | 0.90 | 0.79 | 0.96 | 1.41 | 0.39 | – | – | – | – | – |
4 | 120 | 17 (14.2) | 0.86 | 0.72 | 0.93 | 0.95 | 0.88 | – | – | – | – | – |
5 | 120 | 8 (6.7) | 0.93 | 0.84 | 0.97 | 2.21 | 0.08 | – | – | – | – | – |
6 | 120 | 13 (10.8) | 0.89 | 0.77 | 0.95 | 1.29 | 0.52 | – | – | – | – | – |
7 | 120 | 11 (9.2) | 0.91 | 0.80 | 0.96 | 1.56 | 0.28 | – | – | – | – | – |
8 | 120 | 8 (6.7) | 0.93 | 0.84 | 0.97 | 2.21 | 0.08 | – | – | – | – | – |
9 | 120 | 10 (8.3) | 0.92 | 0.82 | 0.97 | 1.73 | 0.19 | – | – | – | – | – |
10 | 120 | 11 (9.2) | 0.90 | 0.79 | 0.96 | 1.42 | 0.35 | – | – | – | – | – |