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. Author manuscript; available in PMC: 2011 May 1.
Published in final edited form as: Am J Obstet Gynecol. 2010 May;202(5):433.e1–433.e8. doi: 10.1016/j.ajog.2010.02.007

TABLE 2. Logistic regression for preterm delivery within 7 days of amniocentesis.

Explanatory variable Odds ratio 95% CI P value
Gestational age at diagnosis of short cervix, wks 0.46 0.16–1.37 .16
Cervical length, mm 0.29 0.02–3.8 .34
Amniotic fluid MMP-8 concentration >23 ng/mL 55.4 1.1–2807 .045

CI, confidence interval.