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Calculated expulsive force acting on the fetal head at the peak of the uterine contraction, at the peak of the maternal push, and at the peak when the 2 variables are combined
| Peak Uterine Contraction (N) | 74 |
| Peak Maternal Push (N) | 101 |
| Peak Uterine Contraction + Maternal Push (N) | 175 |
