Table 2.

Frequency and rate of preterm births by model of care before and after propensity score matching.

Outcomes	Before matching (n = 1024)
	Standard care (n = 563)	BioC (n = 461)	OR (95% CI)	P-value
Preterm births	65 (11·6%)	32 (6·9%)	0·57 (0·37, 0·89)	0·013
Term births	498 (88·4%)	429 (93·1%)	Reference

Outcomes	After matching (n = 690)
	Standard care (n = 345)	BioC (n = 345)	OR (95% CI)	P-value
Preterm births	48 (13·9%)	26 (7·5%)	0·50 (0·31, 0·83)	0·008
Term births	297 (86·1%)	319 (92·5%)	Reference