Predictive value of the trans-perineal three-dimensional ultrasound measurement of the pubic arch angle for vaginal delivery

Table 4 Predictive effect of the subpubic arch angle with respect to the second stage of labor in the normal vaginal delivery group

Predictors	B (95%CI)	P value
Age (yr)	0.17 (0.002 to 0.071)	0.039
Height (meters)	-0.18 (-4.63 to -0.55)	0.013
Gestational age at delivery (wk)	0.02 (-0.10 to 0.13)	0.853
BMI (kg/m2)	-0.11 (-0.074 to 0.005)	0.087
Weight gain (kg)	0.02 (-0.02 to 0.03)	0.765
Birth weight (g)	0.09 (0.000 to 0.001)	0.316
SPAA (°)	0.13 (-0.001 to 0.03)	0.045

BMI: Body mass index; SPAA: Subpubic arch angle.