From: Analysis of cervical resistance during continuous controllable balloon dilatation: controlled clinical and experimental study
Lower film ICO
p Value
Number of births
ρ = −0.109a
0.497
Number of miscarriages
ρ = −0.083a
0.604
Number of abortions
ρ = 0.007a
0.966
Lower film ECO
r = 0.455b
0.003c
Upper film ICO
r = 0.169b
0.290
Upper film ECO
r = 0.207b
0.194