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Table 1 Descriptive characteristics of the total sample, respondents and non-respondents in the survey (N = 100 000)

From: Self-reported symptoms and healthcare seeking in the general population -exploring “The Symptom Iceberg”

  Total sample Respondents Non-respondents     
  N % n % n % P-value*
Sex        
Male 48 910 48.9 23 240 46.8 23 407 51.4 <0.001
Female 51 090 51.1 26 466 53.2 22 140 48.6
Age        
2039 27 706 27.7 12 251 24.6 15 455 30.7 <0.001
4059 37 106 37.1 20 305 40.9 16 801 33.4
6079 28 868 28.9 15 748 31.7 13 120 26.1
80- 6 320 6.3 1 402 2.8 4 918 9.8
Marital statusa        
Single 31 140 32.8 12 475 25.1 18 665 41.2 <0.001
Married/living together 63 807 67.2 37 140 74.9 26 667 58.8
Educational levela        
Low 24 770 27.2 9 540 19.7 15 230 35.6 <0.001
Medium 40 659 44.6 22 155 45.8 18 504 43.3
High 25 752 28.2 16 724 34.5 9 028 21.1
Income levela        
Low 22 440 23.6 8 072 16.3 14 368 31.7 <0.001
Medium 48 126 50.7 25 712 41.8 22 414 49.4
High 24 382 25.7 24 382 31.9 8 551 18.9
Employment statusa        
Workning 59 961 63.1 33 961 68.4 26 000 57.3 <0.001
Pensioners 23 193 24.4 11 294 22.7 11 899 26.2
Out of workforce 11 911 12.5 4 410 8.9 7 501 16.5
Ethnic groupsa        
Danish 86 248 90.8 46 543 93.8 39 705 87.6 <0.001
Immigrants 8 038 8.5 2 858 5.8 5 180 11.4
Descendants of Immigrants 661 0.7 214 0.4 447 1.0
GP contactsa        
Average contacts to GP in 2011 8.1   7.6   8.5   <0.001
  1. aTotal numbers for each group may not add up to full sample, 5 to 9 % missing data from Statistics Denmark
  2. *Differences between respondents and non-respondents according to descriptive characteristics were tested using chi-square tests