| 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 | 
       
      |