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Table 1 Sample characteristics by early biological risk

From: Environmental noise exposure, early biological risk and mental health in nine to ten year old children: a cross-sectional field study

  Not at risk n = 1704 At risk n = 196 p*
Country (%)    
   UK 40.3 49.5  
   Netherlands 30.2 22.4  
   Spain 29.6 28.1 .026
Gender (%)    
   Male 48.2 38.3  
   Female 51.8 61.7 .008
Age in days    
   Mean (SD) 3844.5 (180.4) 3858.8 (192.5) .298
Employment status (%)    
   Unemployed 13.0 20.9  
   Employed 87.0 79.1 .002
Crowding at (%)    
   Not crowded 79.5 83.7  
   Crowded 20.5 16.3 .169
Home ownership (%)    
   Not owned 24.6 31.6  
   Owned 75.4 68.4 .032
Mother's educational achievement    
   Mean (SD) 0.49 (0.28) 0.51 (0.30) .260
Long-standing illness (%)    
   No 76.0 73.0  
   Yes 24.0 27.0 .348
Main language spoken at home (%)    
   No 8.7 10.7  
   Yes 91.3 89.3 .345
Parental support scale    
   Mean (SD) 10.0 (2.0) 10.3 (1.8) .129
Classroom glazing type (%)    
   Single 50.4 55.6  
   Double (or both single and double) 46.4 44.4  
   Triple 3.2 0.0 .024
  1. *p represents significance value for χ2 test or t-test depending on nature of data.