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Table 1 Characteristics of the children that completed the NES and whose parents returned their questionnaire (n = 485) and the schools they visit (n = 24).

From: Neurobehavioral effects of transportation noise in primary schoolchildren: a cross-sectional study

  % Mean +/- Std Range
Age (yrs)   10.5 +/- 0.6 8.8 - 12.8
% girls 48.8   
Socio-economic status
% employeda) 91.9   
% crowdedb) 32.9   
% homeowners 81.4   
Mother's education (index 0-1)c)   0.5 +/- 0.3 0.0 - 1.0
% longstanding illnessd) 27.7   
% ADHD 1.9   
% dyslexia 3.5   
% main language at home is Dutch 93.4   
Parental support (scale 1-12)e)   8.6 +/- 1.9 3 - 12
Glazing
% Single glazing at school 47.8   
% Double glazing at school 49.5   
% Triple glazing at school 2.7   
% Double glazing at home 55.6   
Noise exposure (LAeq, 7-23 hr) in dB(A)
Aircraft noise at school   48.6 +/- 7.1f) 36.3 - 62.8
Aircraft noise at home   48.1 +/- 7.1f) 34.5 - 63.4
Road traffic noise at school   48.7 +/- 8.6f) 34.0 - 62.0
Road traffic noise at home   50.2 +/- 7.3f) 28.0 - 67.0
  1. a) measure of the highest employment status in the child's household. At least one of the parents has to do paid work for at least 19 hrs per week.; b) This is an objective measure of the number of people per room at home. If the number of people is smaller/equal to the number of rooms than the child's household is defined as crowded; c) Mother's education was measured using a ranked index of standard qualifications. A relative index was then calculated for this variable in order to make comparisons between different measures in each country. The index ranges from 0 to 1, with higher number indicating low educational attainment; d) based on parental reports of the child having either attention deficit hyperactivity disorder (ADHD), asthma/bronchitis, eczema, epilepsy, depression, diabetes or dyslexia; e) parental support for school work is assessed by a self-report scale in the children's questionnaire This ordinal scale (alpha = 0.65) was constructed by means of the following items: "If I have a problem at school my parents/carers are ready to help." "My parents/carers are willing to come to school and talk to teachers", and "My parents/carers encourage me to do well at school". Answers were indicated on a 4-point category scale ("Never, sometimes, often, always"). The score on each of the items was summed up (possible score 3-12); f) presented are the arithmetic mean and corresponding standard deviation; Abbreviations: Std = Standard Deviation.