From: Analysis of cervical resistance during continuous controllable balloon dilatation: controlled clinical and experimental study
Upper film ECO
p Value
Number of births
ρ = 0.009a
0.956
Number of miscarriages
ρ = 0.042a
0.796
Number of abortions
ρ = 0.034a
0.831
Upper film ICO
r = 0.611b
0.000c
Lower film ICO
r = 0.207b
0.194
Lower film ECO
r = 0.657b