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

Table 3 Predictive effect of the subpubic arch angle with respect to the duration of the first stage of vaginal delivery and other factors

Predictors	B (95%CI)	P value
Age (yr)	-0.02 (-0.21 to 0.16)	0.789
Height (meters)	-0.09 (-17.39 to 4.62)	0.254
Gestational age at delivery (wk)	0.02 (-0.50 to 0.66)	0.785
BMI (kg/m2)	-0.03 (-0.25 to 0.18)	0.758
Weight gain (kg)	-0.19 (-0.31 to 0.02)	0.025
Birth weight (g)	0.13 (0.000 to 0.003)	0.135
SPAA (°)	0.06 (-0.05 to 0.12)	0.459

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