Fig. 4

Group B: median force in the superior dental arch. On the x-axis is the test number and on the y-axis is the median force [N] in the superior dental arch. In this graph only group B, group of anesthesiologists with sound and visual feedback, is found because it is statistically different from group C, group of anesthesiologists with sound and visual feedback and support of expert neonatologist, in superior dental arch