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Table 4 Rates and univariate odds ratios for non-traceability and refusal and for self-completion of Kidscreen questionnaire

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

  Non-traceability a Refusal a Child completion of KIDSCREEN
  % OR (95% CI) % OR (95% CI) % OR (95% CI)
Child characteristics
Gender          
   Male 13 1.0 - 23 1.0 - 59 1.0 -
   Female 12 0.9 (0.6 to 1.3) 26 1.2 (0.9 to 1.5) 64 1.2 (0.9 to 1.6)
Age in years          
   7 and 8 7 1.0 - 27 1.0 - 57 1.0 -
   9 13 1.9 (1.0 to 3.5) 19 0.6 (0.4 to 1.0) 66 1.5 (1.0 to 2.3)
   10 12 1.7 (0.9 to 3.1) 19 0.6 (0.4 to 1.0) 56 1.0 (0.6 to 1.5)
   11 13 1.9 (1.0 to 3.4) 26 1.0 (0.6 to 1.5) 66 1.5 (0.9 to 2.3)
   12 and 13 17 2.5 (1.4 to 4.5) 30 1.2 (0.8 to 1.8) 61 1.2 (0.8 to 1.8)
Walking ability b          
   Walks unaided 14 1.0 - 29 1.0 - 80 1.0 -
   Walks using aids 11 0.8 (0.5 to 1.3) 18 0.5 (0.4 to 0.8) 67 0.5 (0.3 to 0.8)
   Unable to walk 11 0.8 (0.5 to 1.2) 21 0.6 (0.4 to 0.9) 28 0.09 (0.07 to 0.14)
Seizures b          
   No 12 1.0 - 25 1.0 - 74 1.0 -
   Yes 12 1.1 (0.7 to 1.6) 25 1.0 (0.7 to 1.4) 29 0.1 (0.1 to 0.2)
Vision problems b          
   No 12 1.0 - 24 1.0 - 65 1.0 -
   Yes 11 0.8 (0.5 to 1.5) 27 1.2 (0.8 to 1.8) 7 0.03 (0.01 to 0.1)
Hearing problems b          
   No 13 1.0 - 27 1.0 - 62 1.0 -
   Yes 9 0.7 (0.2 to 2.2) 19 0.6 (0.3 to 1.6) 22 0.2 (0.06 to 0.5)
IQ          
   >70 - - - - - - 94 1.0  
   50 to 70 - - - - - - 65 0.1 (0.1 to 0.2)
   <50 - - - - - - 5 0.003 (0.002 to 0.007)
Centre characteristics
Method of approach          
   Direct 13 1.0 - 24 1.0   - - -
   Indirect 12 0.9 (0.7 to 1.3) 25 1.1 (0.8 to 1.4) - - -
  1. a Excluding North West Germany, where children were not sampled from a population-based register
  2. b For assessment of response, impairment at age 4–5 years was obtained from the register; for assessment of child completion, impairment was obtained from interview.