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Table 3 Comparative risk functions comparing non-response, demographic characteristics and self-completion by region with entire study population

From: Assessment of data quality in a multi-centre cross-sectional study of participation and quality of life of children with cerebral palsy

  (a) Non-response    
  Overall non-response Non-response due to failure to trace families Non-response of traced families    
  % CRF 95%CI % CRF 95%CI % CRF 95%CI    
North England 35 0.9 (0.7 to 1.2) 22 2.0 (1.5 to 2.8) 15 0.6 (0.4 to 0.9)    
West Sweden 62 2.8 (2.2 to 3.5) 16 1.4 (1.0 to 1.9) 52 3.4 (2.6 to 4.3)    
Northern Ireland 49 1.6 (1.3 to 2.1) 5 0.3 (0.2 to 0.6) 41 2.2 (1.7 to 2.8)    
South East France 45 1.4 (1.0 to 1.9) 19 1.7 (1.1 to 2.5) 21 0.8 (0.5 to 1.3)    
South West Ireland 9 0.2 (0.1 to 0.3) 2 0.1 (0.0 to 0.5) 6 0.2 (0.1 to 0.4)    
East Denmark 20 0.4 (0.3 to 0.6) 8 0.6 (0.4 to 1.1) 8 0.3 (0.1 to 0.5)    
Central Italy 13 0.3 (0.1 to 0.5) 8 0.6 (0.3 to 1.3) 6 0.2 (0.1 to 0.4)    
South West France 31 0.8 (0.5 to 1.1) 15 1.3 (0.8 to 2.1) 16 0.6 (0.3 to 1.0)    
North West Germany             
All centres 37 1.0 - 12 1.0 - 24 1.0 -    
p for heterogeneity    <0.001    <0.001    <0.001    
  (b) Socio-demographic characteristics
  Parental educational qualifications above the minimum At least one parent working full-time (or equivalent) Family living in urban environment Child goes to special school or special unit in mainstream school
  % CRF 95%CI % CRF 95%CI % CRF 95%CI % CRF 95%CI
North England 61 0.5 (0.4 to 0.7) 57 0.4 (0.3 to 0.5) 88 3.9 (2.3 to 6.8) 41 0.8 (0.6 to 1.1)
West Sweden 91 3.3 (1.5 to 7.0) 78 1.1 (0.7 to 1.8) 70 1.2 (0.8 to 1.9) 52 1.2 (0.8 to 1.8)
Northern Ireland 51 0.3 (0.2 to 0.5) 66 0.6 (0.4 to 0.8) 60 0.8 (0.6 to 1.2) 58 1.5 (1.1 to 2.2)
South East France 73 0.9 (0.5 to 1.4) 84 1.5 (0.8 to 2.8) 52 0.6 (0.4 to 0.9) 67 2.3 (1.4 to 3.7)
South West Ireland 71 0.8 (0.5 to 1.1) 78 1.1 (0.7 to 1.7) 56 0.7 (0.5 to 1.0) 28 0.4 (0.3 to 0.7)
East Denmark 96 6.9 (2.8 to 17) 84 1.6 (1.0 to 2.5) 67 1.1 (0.8 to 1.6) 54 1.3 (0.9 to 1.9)
Central Italy 80 1.2 (0.8 to 2.1) 81 1.3 (0.7 to 2.1) 66 1.0 (0.7 to 1.6) 7 0.1 (0.0 to 0.2)
South West France 84 1.6 (0.9 to 3.0) 92 3.5 (1.5 to 7.9) 61 0.8 (0.5 to 1.3) 45 0.9 (0.6 to 1.4)
North West Germany 84 1.6 (0.9 to 3.0) 85 1.7 (0.9 to 3.2) 55 0.7 (0.4 to 1.0) 80 4.5 (2.6 to 7.8)
All centres 76 1.0 - 77 1.0 - 65 1.0 - 47 1.0 -
p for heterogeneity    <0.001    <0.001    <0.001    <0.001
  (c) Completion of KIDSCREEN by child          
  % CRF 95%CI          
North England 67 1.3 (0.9 to 1.9)          
West Sweden 55 0.8 (0.5 to 1.2)          
Northern Ireland 57 0.8 (0.6 to 1.2)          
South East France 57 0.8 (0.5 to 1.3)          
South West Ireland 68 1.4 (0.9 to 2.1)          
East Denmark 70 1.5 (1.0 to 2.2)          
Central Italy 47 0.6 (0.4 to 0.8)          
South West France 61 1.0 (0.6 to 1.5)          
North West Germany 60 1.0 (0.6 to 1.5)          
All centres 61 1.0 -          
p for heterogeneity    0.02          
  1. CRF = Comparative risk function
  2. CRF <1 and >1 indicate proportions below and above the mean respectively; proportions significantly below the mean are show n in bold; proportions significantly above the mean are show n in bold and italics.