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Table 1 Comparison between respondent and non-respondent to initial questionnaire in the two municipalities

From: Screening for type 2 diabetes in a high-risk population: study design and feasibility of a population-based randomized controlled trial

  Capelle aan den IJssel     Dordrecht    
  Total Responders Non-responders P-value* Total Responders Non-responders P-value*
  N = 29,163 n = 7,779 n = 21,385   N = 49,979 N = 12,799 N = 37,180  
Age at mailing, median, yrs† 53.6 55.1 52.9 0.000 54.1 55.9 53.5 0.000
Gender, male, % 47.9 45.9 48.6 0.000 49.6 46.5 50.7 0.000
Country of birth, %         
Netherlands 82.9 88.3 80.9 0.000 84.0 89.9 81.9 0.000
Other 17.1 11.7 19.1   16.0 10.1 18.1  
Western country 6.6 4.7 7.2   6.3 4.8 6.8  
Non-Western country 10.6 7.0 11.8   9.7 5.3 11.2  
Social Status, %         
High 30.3 39.2 27.0 0.000 0.8 0.6 0.9 0.000
Middle high 5.1 3.8 5.6   43.1 51.3 40.3  
Middle low 42.8 33.2 46.4   23.6 21.7 24.3  
Low 21.8 23.8 21.0   32.5 26.4 34.6  
  1. *Chi-square test for comparison of proportions and unpaired t-test for comparison of continuous variables between responders and non-responders.
  2. †Age at mailing of study material.