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Table 3 Comparison of peripartal risk factors for colonization with enterococci and multidrugresistant enterococci in meconium and surveillance cultures of infants. For differences in proportions between two groups, the Fisher's exact test was performed.

From: Enterococcal colonization of infants in a neonatal intensive care unit: associated predictors, risk factors and seasonal patterns

1. Gestational age < 32 weeks (n = 63) ≥ 32 weeks (n = 211) Relative risk (95% CI) p
Enteroccous-positive 21 (33.3%) 42 (19.9%) 1.675 (1.076–2.605) 0.0395
aMDR-enterococcus-positive 19 (30.2%) 17 (8.1%) 3.743 (2.073–6.759) <0.0001
2. Birth weight < 2.500 g (n = 138) ≥ 2.500 g (n = 136)   
Enterococcus-positive 38 (27.5%) 25 (18.4%) 1.498 (0.959–2.340) 0.085
aMDR-enterococcus-positive 25 (18.1%) 11 (8.1%) 2.240 (1.148–4.371) 0.019
  < 1.000 g (n = 27) ≥ 1.000 g (n = 247)   
Enterococcus-positive 11 (40.7%) 52 (21.1%) 1.935 (1.156–3.239) 0.0293
aMDR-enterococcus-positive 11 (40.7%) 25 (10.1%) 4.025 (2.237–7.244) 0.0001
3. Prepartal hospitalization ≥ 3 days (n = 49) < 3 days (n = 224)   
Enterococcus-positive 11 (22.4%) 52 (23.2%) 0.967 (0.546–1.714) 1.000
aMDR-enterococcus-positive 7 (14.3%) 29 (12.9%) 1.108 (0.516–2.383) 0.816
4. Prepartal antibiotics ≥ 1 day (n = 54) < 1 day (n = 216)   
Enterococcus-positive 16 (29.6%) 42 (19.4%) 1.460 (0.893–2.388) 0.146
aMDR-enterococcus-positive 12 (22.2%) 21 (9.7%) 2.286 (1.201–4.351) 0.019
5. Delivery mode Cesarean section (n = 174) Vaginal delivery (n = 100)   
Enterococcus-positive 42 (24.1%) 21 (21.0%) 1.149 (0.724–1.826) 0.655
aMDR-enterococcus-positive 28 (16.1%) 8 (8.0%) 2.011 (0.954–4.243) 0.0641
6. Maternal rectovaginal colonization Enterococcus-positive (n = 53) Enterococcus-negative (n = 47)   
Enterococcus-positive 9 (17.0%) 8 (17.0%) 0.998 (0.419–2.374) 1.000
aMDR-enterococcus-positive 1 (1.9%) 2 (2.1%) 0.443 (0.042–4.737) 0.600
7. PROM b ≥ 24 hours (n = 17) < 24 hours (n = 248)   
Enterococcus-positive 2 (11.8%) 58 (23.4%) 0.478 (0.128–1.791) 0.376
aMDR-enterococcus-positive 2 (11.8%) 32 (12.9%) 0.912 (0.238–3.488) 1.000
  1. aMDR indicates multidrug-resistant, bPROM premature rupture of membranes