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Table 4 Comparison of the parent-reported characteristics between the participants and non-participants

From: A population-based nested case control study on recurrent pneumonias in children with severe generalized cerebral palsy: ethical considerations of the design and representativeness of the study sample

   Non-participants Participants
    Valid*   valid*
Total number 379   194  
Mean Age (years) 10.6 (4.3) 0.67 8.9 (4.4) 1
Gender (% of boys) 50.2 0.7 53.1 1
Mean Height (cm) 130.3 (21.9) 0.52 124.0 (20.1) 0.91
Median Weight (kg) 28.0 [17.0] 0.59 24.7 [16.1] 0.88
Median BMI (kg/m2) 16.4 [4.2] 0.51 15.9 [4.0] 0.85
Dysphagia severe (%) 27.3   37.8  
  moderate (%) 17.7   51.2  
  no / mild (%) 55.0 0.68 11.0 0.65
Lower respiratory tract infections (%) 16.9 0.68 27.3 0.45
recurrent** (%) 12.5 0.67 18.2 0.45
Reported gastro-oesophageal reflux (%) 25.1   44.3 0.72
  1. Standard deviations are between brackets, inter quartile range is between square brackets, *valid = fraction of the population with known information, ** recurrent = two or more episodes per year, BMI = body mass index.