Figure 4: (Upper figure) Highest FHR score in the 1st stage of labor (X) was closely correlated to the Apgar score (Y), Y=9.361-0.335X, R2=0.84, p<0.05. (Lower figure) Also the umbilical arterial blood pH (Y) was correlated with FHR score (X), Y=7.31-0.01X, R=0.85, p=0.024. Fetal outcome is predicted by the FHR score even in early stage of labor [9].