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. Author manuscript; available in PMC: 2008 Mar 1.
Published in final edited form as: Clin Biochem. 2007 Jan 5;40(5-6):330–335. doi: 10.1016/j.clinbiochem.2006.11.01

Table 3.

Odds ratio and 95% CI of preterm subgroups according to maternal serum C - reactive protein concentrations measured in early pregnancy, Seattle and Tacoma, WA, 1996-2002.

Controls Spontaneous preterm delivery Preterm premature rupture of membrane Medically indicated preterm delivery
(n=1,623) (n=48) (n=54) (n=44)
C-Reactive Protein (mg/l) n n OR* (95%CI) n OR* (95%CI) n OR* (95%CI)
Quartile 1 (<2.0) 388 10 1.00 Reference 11 1.00 Reference 5 1.00 Reference
Quartile 2 (2.0-3.9) 385 13 1.29 (0.52-3.17) 18 1.89 (0.85-4.23) 4 0.75 (0.17-3.42)
Quartile 3 (4.0-7.4) 391 7 0.88 (0.32-2.43) 10 1.03 (0.40-2.63) 11 2.77 (0.85-9.04)
Quartile 4 (≥ 7.5) 389 16 2.15 (0.85-5.42) 14 1.48 (0.56-3.86) 19 3.29 (0.98-11.02)
Missing 70 2 1 5
Trend test p-value 0.198 0.736 0.012
*

Adjusted for maternal age, race, parity, pre-pregnancy body mass index and gestational age at blood collection 70 controls and 8 cases were not included in the analysis of CRP because of missing data.