. Author manuscript; available in PMC: 2015 Feb 1.

Published in final edited form as: Am J Obstet Gynecol. 2013 Oct 7;210(2):128.e1–128.e6. doi: 10.1016/j.ajog.2013.10.008

Table 2.

Risk of Preterm Birth by Quartile of 17-OHPC Concentration

Quartile (Plasma 17-OHPC)	PTB		Indicated PTB		Spontaneous PTB
	n (%)	OR (95% CI)	n (%)	OR (95% CI)	n (%)	OR (95% CI)
Quartile1 (3.7-8.1 ng/ml)	37 (46.3%)		4 (5.0%)		33 (41.3%)
Quartile2 (8.2-9.8 ng/ml)	20 (27.0%)	0.43 (0.22 -0.85)	2 (2.7%)	0.53 (0.09 – 2.97)	18 (24.3%)	0.46 (0.23 – 0.92)
Quartile3 (9.9-12.4 ng/ml)	24 (29.6%)	0.49 (0.26 -0.94)	2 (2.5%)	0.48 (0.09 – 2.70)	22 (27.2%)	0.53 (0.27 – 1.03)
Quartile4 (12.5-56 ng/ml)	25 (31.3%)	0.53 (0.28 -1.01)	6 (7.5%)	1.54 (0.42 – 5.68)	19 (23.8%)	0.44 (0.23 – 0.88)
Trend Test P value	0.07		0.49		0.03