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Table 2 Characteristics of 216 preterm infants at time of rectal bleeding in cases and before the corresponding postnatal 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*
Characteristics at time of rectal bleeding    
Postconceptional age (weeks) 34 [30–42] 34 [28–45] 0.1
Body weight (g) 1829 [1138–5030] 1690 [940–4630] 0.230
Body weight < −2 SD, n (%) 51 (35.4) 34 (47.9) 0.08
X-ray intestinal distension, n (%) 12 [8;3] 29 [40;3] 0.001
Enteral feeding at time of rectal bleeding    
Human milk, n (%) 61 (42.4) 48 (66.7) 0.439
Preterm formula, n (%) 52 (36.1) 15 (20.8) 0.136
Human milk and preterm formula n, (%) 31 (21.5) 9 (12.5) 0.425
Starch-based thickener, n (%) 13 (9) 4 (5.6) 0.462
Carob-based thickener, n (%) 8 (5.6) 1 (1.4) 0.558
  1. Number of subjects (%) or median [min-max].
  2. *Chi-2 test (or Fisher’s exact test when required) and Wilcoxon test were performed to compare qualitative and quantitative value, respectively.