Multiple Logistic Regression of Factors Associated with GBS Colonization
All the 6 variables significantly associated with GBS colonization in the univariate analyses (smoking, maternal age, birthweight, gestational age, race, and use of substance) were now selected for inclusion in the multiple logistic regression analysis. Tobacco smoking was by far the most significant predictor of GBS colonization even after controlling for the other confounders (OR=2.6, 95% CI: 1.53-4.34; P <0.001, also see Table 3). The only other risk factor independently associated with GBS colonization was maternal age < 20 years (P=0.041).