Duration– Time from the start of 1 contraction to the end of the same contraction (i.e. How long the contraction lasts)
Frequency– Time from the start of 1 contraction to the beginning of another (i.e. Time between the start of the first contraction to the start of the next contraction)
Start
End
Duration
Frequency
Pregnancy After 40 – Timing Contractions Chart Download