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Table 2 Laboratory tests results in the studied groups

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 Control group p value
  N=22 N=20  
Spirometry and bronchial responsiveness (expressed as mean ± SD)    
FEV1 (%) 81.3±13 95.8±8 <0.001a
FVC (%) 79±13 89±7 <0.001a
MEF50 (%) 62±19 87±26 <0.001a
Δ%FEV1 (%) 6.8±12.3 3.6±5.9 0.3a
Δ%MEF50 (%) 31±32 19±17 0.15a
FEV1 < 80% predicted value 10 (45%) 0 0.001b
Δ%FEV1 >12% 4 (18%) 1 (5%) 0.3b
FeNO (ppb)
Median (25th-75th percentile) 8 (8–13) 10 (8–14) 0.2c
Normal (≤20 ppb) 22 15 0.02b
Intermediate (20–35 ppb) 0 3  
High (>35 ppb) 0 2  
  N=81 N=40  
serum tIgE (kU/L)
Geometric mean (± SD) 32±4 56±4 0.002a
High (>upper limit for age) 10 (12%) 12 (32%) 0.02b
Others
Absolute eosinophil count per uL) 265±202 225±185 0.3a
Positive SPT 8 (11%) 9 (24%) 0.09b
  1. p value for ANOVAa, chi square testb, and Kruskal-Wallis test.
  2. ELBW – extremely low birth weight.
  3. SPT – skin prick test.