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Table 4 Results of the logistic regression model with VZV seropositivity as the dependent variable; data set stratified in three age groups: children 1 to 6 years of age, 7 to 10, and 11 to 17 years of age. Variables with statistically significant results presented here. Germany (sera collected 2003–2006, available for logistic regression model n = 11,374)

From: Varicella-zoster virus seroprevalence in children and adolescents in the pre-varicella vaccine era, Germany

  Age 1 to 6 years Age 7 to 10 years Age 11 to 17 years
n = 3162 n = 3058 n = 5154
Variable OR 95% CI OR 95% CI OR 95% CI
Age 1 year Referent      
 2 years 2.2 1.4–3.7     
 3 years 4.1 2.5–6.9     
 4 years 11.0 6.6–18.3     
 5 years 21.7 12.8–37.1     
 6 years 51.0 30.6–85.3     
 7 years    Referent    
 8 years    1.4 1.0–1.9   
 9 years    2.0 1.3–3.1   
 10 years    2.5 1.6–4.1   
Siblings living in the same household:
 only child Referent Referent Referent Referent Referent Referent
 younger or same age of the siblings 1.1 0.9–1.5 1.7 1.1–2.6 1.7 1.2–2.4
 older siblings 2.3 1.9–2.9 1.3 0.9–1.8 1.2 0.8–1.8
Age at start of day-care attendance (1 to 10 year olds)
  < 1 year 1.6 1.0–2.5 1.8 0.7–4.2   
 1 year 1.6 1.1–2.2 2.0 1.1–3.5   
 2 years 1.3 0.9–1.8 4.1 2.2–7.7   
  > = 3 years 0.9 0.7–1.2 1.7 1.2–2.4   
Migration background:
 none 1.3 0.9–1.7 1.5 1.0–2.3 1.6 1.0–2.5
 one-sided 1.1 0.7–1.7 1.3 0.6–2.5 1.5 0.8–3.0
 two-sided Referent   Referent   Referent