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Table 1 Description of the two study groups

From: Incidence and comparison of retrospective and prospective data on respiratory and gastrointestinal infections in German households

  Prospective study group Retrospective study group Significance (p-value for differences between the study arms)
Median household size (interquartile range (IQR)) 4 (3; 4) 4 (3; 5) p = 0.08
  N % N %  
Household level 77 100.0 100 100.0  
Highest education of the parents  
 Professional or university training 59 76.6 78 78.0 p = 0.47
 Max. intermediate level of vocational or secondary education 17 22.1 17 17.0
 Missing information 1 1.3 5 5.0
Household members level 282 100.0 404 100.0  
Age  
 0–3 years 63 22.3 84 20.8 p = 0.48
 4–6 years 49 17.4 57 14.1
 7–15 years 16 5.7 28 6.9
 16 years and older 150 53.2 234 57.9
 Missing information 4 1.4 1 0.3
Sex  
 Female 146 51.8 197 48.8 p = 0.79
 Male 134 47.5 206 51.0
 Missing information 2 0.7 1 0.3