Step of induction LT LMAS P value
1. Withdrawal of material from bag 0   (0%) 0   (0%)  
2. Head tilt 28 (18.8%) 30 (20%) 0.79
    no correction 21 (75%) 27 (90%) 0.18
3. Wrong direction of device 7   (4.7%) 9   (6%) 0.79
    no correction 6   (85.7%) 5   (55.6%) 0.14
4. No insertion up to marker 61 (40,9%) 49 (32.7%) 0.15
    no correction 58  (95.1%) 42 (85.7%) 0.06
5. Cuff inflation 22 (14.8%) 9 (6%) 0.001
6. No connection to BVM 11 (7.4%) 1  (0.7%) 0.003
7. Forgotten squeeze of BVM 3   (2%) 1  (0.7%) 0.3
8. Cuff valve identification 12 (8%) 33 (22%) 0.03
Table 2: Procedural mistakes identified using LT or LMAS.