. 2021 Jun 18;105(4):827–836. doi: 10.1093/biolre/ioab119

Table 4.

Combined effect of CLOCK and CRY2 (median splits) on sPTB in 2nd trimester maternal blood (n = 51 sPTB, n = 106 term) with logistic regression model.

	N (%)	Term, n (%)	sPTB, n (%)	OR_{sPTB vs term} (95% CI)	P
High risk level^*	40 (100.0)	20 (50.0)	20 (50.0)	4.86 (1.75, 13.51)	0.0025
Middle risk level^***	76 (100.0)	52 (68.4)	24 (31.6)	2.24 (0.87, 5.78)	0.0946
Low risk level^**	41 (100.0)	34 (32.1)	7 (13.7)	Ref.

^*Both CLOCK and CRY2 transcripts ≤ median.

^**Both CLOCK and CRY2 transcripts > median.

^***All other combinations.