TABLE 4.

Multivariate logistic-regression analysis for assessment of independent risk factors for late abortion or preterm birth at <34 weeks of gestation

Risk factor	β	P	OR (95% CI)a
Constant	−0.02
U. parvum	1.11	0.035	3.04 (1.08-8.52)
Use of penicillin or cefatrizine at <22 wk	1.44	0.003	4.24 (1.63-10.00)
Past history of preterm birth	2.35	0.001	10.44 (2.69-40.49)

^aOR, odds ratio; CI, confidence interval.