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Table 1 Association between risk factors and GBS colonization among pregnant women

From: Group B streptococcal colonization in mothers and infants in western China: prevalences and risk factors

Variables GBS carriers (n = 210) (n,%) GBS negative (n = 3229) (n,%) OR(95% CI) P value
Maternal age (years)     0.040
 18–39 207(98.6) 3080(95.4) 3.33(1.05–11.1)  
 ≥40a 3(1.4) 149(4.6)   
Ethnic     0.048
 Han-Zhuanga 190(90.5) 3033(93.9)   
 Minority 20(9.5) 196(6.1) 1.63(1.01–2.64)  
Education level
  ≤ 9 years of schoola 91(43.3) 1422(44.0)   
 10–12 years of school 67(31.9) 1116(34.6) 0.94(0.68–1.30) 0.700
  ≥ 13 years of school 52(24.8) 69(21.4) 1.18(0.83–1.67)  
Current smoking
 Noa 209(99.5) 3195(98.9)   
 Yes 1(0.5) 34(1.1) 0.45(0.06–3.30) 0.432
Previous miscarriage
 Noa 195(92.9) 2942(91.1)   
 Yes 15(7.1) 287(8.9) 0.79(0.46–1.35) 0.388
Pregnancy-induced hypertension
 Noa 197(93.8) 3078(95.3)   
 Yes 13(6.2) 151(4.7) 1.35(0.75–2.41) 0.320
Gestational diabetes
 Noa 159(75.7) 2397(74.2)   
 Yes 51(24.3) 832(25.8) 0.92(0.67–1.28) 0.634
Parity
 1-2a 205(97.6) 3088(95.6)   
  ≥ 3 5(2.4) 141(4.4) 0.53(0.22–1.32) 0.174
Maternal previous antibiotic use
 Noa 208(99.0) 3131(97.0)   
 Yes 2(1.0) 98(3.0) 0.31(0.07–1.26) 0.100
  1. OR odds ratio, 95%CI 95% confidence interval
  2. aindicates the reference group in the calculation of OR