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).