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

Table 2 Effects of the subpubic arch angle and other factors on the ability to deliver vaginally

Predictors	Odds ratio (95%CI)	P value
Age (yr)	1.13 (1.00–1.27)	0.042
Height (meters)	0.00 (0.00–0.41)	0.026
Gestational age at delivery (wk)	1.27 (0.87–1.84)	0.214
BMI (kg/m2)	1.11 (0.97–1.26)	0.130
Weight gain (kg)	1.05 (0.97–1.14)	0.256
Birth weight (g)	1.00 (1.001–1.003)	0.000
SPAA (°)	0.90 (0.84–0.95)	0.000

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