Table 2 Intubation characteristics: Cormack and Lehane score, POGO score, and personal review of the participants; POGO, percentage of glottis opening; German school grading system with ratings from 1 (very good) to 6 (very poor)

1.2

.1

77.1

3.7

2.2

.1

1.1

.1

.493

79.8

4.4

.615

2.2

.2

.803

1.0

.0

.104

91.2

2.3

.000

1.9

.3

.090

1.0

.0

.104

93.6

2.2

.000

1.9

.2

.137

1.9

.2

40.2

6.3

2.7

.2

1.4

.1

.015

59.8

6.9

.012

2.1

.2

.045

1.0

.0

.000

89.1

2.4

.000

1.6

.1

.001

1.0

.0

.000

94.3

2.2

.000

1.5

.2

.000

2.7

.2

12.8

4.2

4.0

.3

1.7

.1

.000

48.2

7.2

.000

2.9

.2

.000

1.1

.0

.000

84.8

2.8

.000

1.6

.2

.000

1.1

.1

.000

83.4

4.4

.000

2.4

.3

.000