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Table 4 Results of stool cultures performed during the week before the occurrence of rectal bleeding in cases and during the week before the corresponding age in controls

From: Risk factors of mild rectal bleeding in very low birth weight infants: a case control study

  Controls n = 144 Cases n = 72 p*
Positive stool culture, n (%) 93 (64) 39 (54) 0.139
Staphylococcus aureus, n (%) 18 (12.5) 13 (18.1) 0.272
Coagulase negative Staphylococcus, n (%) 31 (21.5) 13 (18.1) 0.55
Clostridium difficile, n (%) 1 (0.7) 5 (6.9) 0.017
Escherichia coli, n (%) 6 (4.2) 2 (2.8) 0.722
Enterococcus, n (%) 9 (6.3) 2 (2.8) 0.343
Klebsiella pneumoniae, n (%) 2 (1.4) 4 (5.6) 0.097
Proteus mirabilis, n (%) 1 (0.7) 0 1
Klebsiella oxytoca, n (%) 1 (0.7) 0 1
More than two micro organisms, n (%) 24 (16.7) 0 < 0.001
  1. Results expressed as number of subjects (%).
  2. *Chi-2 test or Fisher’s exact test when required.