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Table 3 Influenza-related hospital admissions and length of stay by age-groups, primary diagnosis and presence of complications in Belgium, 20022007

From: Pneumonia and influenza, and respiratory and circulatory hospital admissions in Belgium: a retrospective database study

Total number of hospital admissions (N = 1237517)
Primary diagnosis PI (N = 20960) RC (N = 269634)
Parameters All With complications Without complications All With complications Without complications
  (N = 20960) (N = 11768) (N = 9192) (N = 269634) (N = 171172) (N = 98462)
Hospital admissions, age groups n (%)       
  <5 years 3451 (3.48%)α 892 (0.90%)α 2559 (2.58%)α 18263 (18.42%)α 5514 (5.56%)α 12749 (12.86%)α
  5-17 years 1717 (2.52%)β 343 (0.50%)β 1374 (2.02%)β 7469 (10.96%)β 1510 (2.22%)β 5959 (8.75%)β
  18-49 years 2897 (0.72%)γ 892 (0.22%)γ 2005 (0.50%)γ 41794 (10.38%)γ 13190 (3.27%)γ 28604 (7.10%)γ
  50-64 years 2711 (1.09%)δ 1755 (0.70%)δ 956 (0.38%)δ 59961 (24.02%)δ 39520 (15.83%)δ 20441 (8.19%)δ
  ≥65 years 10184 (2.44%)ϵ 7866 (1.89%)ϵ 2298 (0.55%)ϵ 142147 (34.02%)ϵ 111438 (26.67%)ϵ 30709 (7.35%)ϵ
Length of stay (mean ± standard deviation) (days)       
 - Overall 11.6 ± 12.3 14.6 ± 14.4 7.8 ± 7.4 9.1 ± 12.7 11.3 ± 14.7 5.1 ± 6.4
 - By age groups       
  <5 years α 5.1 ± 4.9 5.9 ± 7.6 4.9 ± 3.5 4.7 ± 5.8 5.9 ± 7.9 4.2 ± 4.4
  5-17 years β 5.3 ± 4.4 6.2 ± 5.0 5.0 ± 4.2 4.1 ± 5.5 6.1 ± 9.0 3.6 ± 4.1
  18-49 years γ 8.8 ± 9.8 12.2 ± 14.0 7.3 ± 6.7 5.5 ± 9.6 9.0 ± 14.9 3.9 ± 4.8
  50-64 years δ 12.5 ± 13.0 14.0 ± 14.8 9.8 ± 8.3 7.8 ± 12.5 9.4 ± 14.5 4.8 ± 5.9
  ≥65 years ϵ 15.4 ± 13.8 16.3 ± 14.6 12.3 ± 9.7 11.4 ± 14.0 12.6 ± 14.9 7.2 ± 8.3
  1. Note: % (age-specific proportion) is defined as the relative proportion of hospital admission in the respective age group; age-specific relative proportions and length of hospital stay are calculated on α, β, γ, δ, ϵwhich indicate total number of hospital admissions in the respective age group; α99125, β68138, γ402779, δ249585, ϵ417890; PI – pneumonia and influenza; RC – respiratory and circulatory.