Table 4.

Derivation of 7-point scoring system to the risk of c-section from stepwise multivariate analysis.

Variable	Coefficient B	SE	B/SE	OR (95% CI)	Score
Gestational age < 37 wg	0.508	0.211	2.408	1.66 (1.10–2.51)	1
Pre-pregnancy BMI (underweight)	–0.9	0.322	–2.795	0.40 (0.22–0.76)	–1
No history of vaginal delivery	0.978	0.211	4.635	2.66 (1.76–4.02)	2
History of uterine surgery	2.121	0.310	6.842	8.34 (4.54–15.30)	3
Obstetrical complications	1.724	0.236	7.305	5.61 (3.53–8.90)	3
Birthweight ⩾ 3500 g	1.453	0.349	4.163	4.28 (2.16–8.47)	2
Non-cephalic presentation	1.007	0.296	3.402	2.74 (1.53–4.89)	1

SE: standard error; OR: odds ratio; CI: confidence interval; wg: weeks of gestation; BMI: body mass index.