Table 3.

Extended two-by-two table for dichotomous outcome (term/preterm)

		LMP		SFH		BS
		≥37 weeks (term)	<  37 weeks (preterm)	≥37 weeks (term)	<  37 weeks (preterm)	≥37 weeks (term)	<  37 weeks (preterm)
US	≥37 weeks (term)	n = 246	n = 98	n = 1025	n = 360	n = 1001	n = 307
	< 37 weeks (preterm)	n = 22	n = 38	n = 48	n = 191	n = 123	n = 89