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Table 1 Acute hepatitis B in Poland in 2010–2014 in birth cohorts unvaccinated in infancy. Distribution of reported cases and incidence by demographic features and history of recent hospitalization

From: Significant proportion of acute hepatitis B in Poland in 2010–2014 attributed to hospital transmission: combining surveillance and public registries data

   N % Incidence per 100,000 p-valuea
Total   440 100 0.33  
Onset year 2010 123 28.0% 0.45 0.822
  2011 101 23.0% 0.37  
  2012 74 16.8% 0.28  
  2013 79 18.0% 0.30  
  2014 63 14.3% 0.24  
Sex Male 285 64.8% 0.45 0.0011
  Female 155 35.2% 0.22  
Birth cohort-groupb 1976–1985 133 30.2% 0.42 < 0.001
  1961–1975 96 21.8% 0.25  
  1946–1960 113 25.7% 0.28  
  born before 1946 98 22.3% 0.42  
Place of residence Urban total 304 69.1% 0.35 0.0156c
  Cities< 100,000 129 29.3% 0.28 0.0149d
  Cities ≥100,000 175 39.8% 0.42  
  Rural 136 30.9% 0.26  
Professional activity (adults) Employed 191 43.4% 0.26 < 0.001
  Unemployed 37 8.4% 0.58  
  Retirees 117 26.6% 0.37  
  Disability pensioners 42 9.5% 0.55  
Hospitalization history Not hospitalized 274 62.3% 0.24 < 0.001
(during the incubation period) Hospitalized 166 37.7% 0.74  
  1. aΧ2 or Hartley’s f test
  2. bBorn after 1985 were vaccinated in infancy or at age 14
  3. cFor two groups: urban total vs rural
  4. dFor 3 groups: cities< 100,000; cities≥100,000; rural