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Table 2 Factors associated with GBS colonization (N = 1513). (a) Categorical factors and continuous variables associated with GBS by univariate analysis—number (%) or mean ± SD, range. (B) Independent risk factors for GBS by multivariate analysis—adjusted odds ratios

From: Association of sexually-transmitted infection and African–American race with Streptococcus agalactiae colonization in pregnancy

Characteristic GBS positive GBS negative p value # Missing/NA
(a)     
Categorical variables     
STI during pregnancy 219/494 (44.3) 315/953 (33.1)  < 0.01** 66
Antibiotic exposure 313/488 (64.1) 471/936 (50.3) < 0.01** 89
AA race 519/519 (86.7) 662/970 (68.2) < 0.01** 24
GBS in prior pregnancy 80/268 (29.9) 109/544 (20.0) < 0.01** 701
Continuous variables     
Age 24.1 ± 5.6, 14–44
(n = 520)
24.6 ± 5.9, 13–49
(n = 973)
0.13 10
BMI 33.7 ± 8.2, 19.4–70.1
(n = 491)
32.3 ± 7.8, 19–69
(n = 928)
< 0.01** 94
Gravidity 2.7 ± 1.8, 1–12
(n = 519)
2.7 ± 1.9, 1–20
(n = 978)
0.97 16
Characteristic Adjusted OR 95% CI for AOR p value # Used
(b)     
African–American race 2.142 2.092–3.861 < 0.01**  
STI during pregnancy 1.309 1.035–1.653 0.02*  
Goodness of fit (Pearson test)    0.45 1432
  1. CI confidence interval
  2. *Significant association with GBS at 5% level of significance (p value < 0.05)
  3. **Significant association with GBS at 1% level of significance (p value < 0.01)