From: A comparison of technicques to disimpact the fetal head on a second stage caesearean simulator
Device
Distance (mm): median (IQR)
p-value
Control
Digital
10 (10 – 15)
1
Tydeman Tube
20 (15 – 40)
<0.01
2
Fetal Pillow
0 (0 – 5)
<0.0001