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Table 1 Comparison of selected demographic and clinical variables between ELBW newborns and the control group a

From: The prevalence and risk factors of allergic and respiratory symptoms in a regional cohort of extremely low birth weight children (<1000 g)

  ELBW group (n=81) Control group (n=40) p value
Birth weight (g), mean (SD) 845 (130) 3554 (512) <0.001b
Gestational age (weeks), mean (SD) 27.2 (2.1) 39.9 (1.4) <0.001b
Female 52 (64) 21 (53) 0.15c
Vaginal delivery 17 (21) 34 (85) <0.001c
Multiple pregnancy 10 (12) 0 (0) <0.001c
Small for gestational age 24 (30) 2 (5) 0.003c
5th min. Apgar score, Me; (25th -75th percentile) 6 (5–7) 10 (9–10) <0.001d
Siblings 47 (58%) 27 (67.5%) 0.33c
School attendance 71 (88%) 40 (100%) 0.03c
Paternal history of atopy 14 (17%) 3 (7.5%) 0.17c
Pets at home 32 (39.5%) 13 (32.5%) 0.7c
Passive smoking    
None 64 32  
History 9 1 0.16c
Current 8 7  
Place of residence    
City area 31 18 0.56c
Rural area 50 22  
  1. aexpressed as a number (percentage) of patients unless otherwise indicated.
  2. p value for ANOVAb, chi square testc, and Kruskal-Wallis testd.
  3. ELBW – extremely low birth weight.