Add the points for each predictor assessed at admission:

Predictor	Category	Points
Maternal age	< 40 years	2
Maternal age	≥ 40 years	0
Vaginal birth history (choose one)	Vaginal birth before and after first caesarean	4
Vaginal birth history (choose one)	Vaginal birth after first caesarean only	2
Vaginal birth history (choose one)	Vaginal birth before first caesarean only	1
Vaginal birth history (choose one)	No previous vaginal birth	0
Indication for first caesarean	Reason other than failure to progress	1
Indication for first caesarean	Failure to progress	0
Cervical effacement at admission	> 75%	2
Cervical effacement at admission	25–75%	1
Cervical effacement at admission	< 25%	0
Cervical dilation at admission	≥ 4 cm	1
Cervical dilation at admission	< 4 cm	0

Total Flamm VBAC score = sum of all points (range 0–10). Higher scores indicate a greater likelihood of successful vaginal birth after caesarean.

VBAC Risk Score for Successful Vaginal Delivery (Flamm Model)