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Table 1 Characteristics of the study population

From: Classical test theory versus Rasch analysis for quality of life questionnaire reduction

  ALL
n = 9,419
MALES
n = 4,478
FEMALES
N = 4,908
Gender (%)   47.5 52.1
Age groups (%)    
   12 – 44 24.5 23.1 26.0
   45 – 54 14.9 15.5 14.5
   55 – 64 18.9 21.6 16.5
   65 – 74 24.6 25.6 23.7
   75 – 99 16.7 14.1 19.2
Study populations    
General population 40.8 38.0 43.5
Primary care patients 7.4 4.5 10.0
Musculoskeletal system & connective tissue diseases 9.2 5.5 12.7
COPD/Asthma 9.2 14.0 4.8
Toxic Oil Syndrome 8.9 6.5 11.2
Chronic Kidney Failure 7.6 9.4 6.0
Cardiovascular diseases 3.2 5.5 0.9
Others 13.8 16.6 10.9
  1. † For a subset of individuals (n = 33) information on gender was not available