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Table 4 Factors affecting the length of serial intervals and the acceleration factors estimated with a multiple parametric model

From: Analysis of influenza transmission in the households of primary and junior high school students during the 2012–13 influenza season in Odate, Japan

Variables No. of cases observed AF 95 % CI
Primary cases    
  Primary school 118 Ref.  
  Junior high school 44 1.29 (1.05–1.59)
Secondary cases    
  Preschool 22 0.77 (0.55–1.08)
  Primary school 31 0.75 (0.55–1.08)
  Junior high school 20 0.60 (0.43–0.85)
  High school 2 0.71 (0.31–1.66)
  Father 26 Ref.  
  Mother 39 0.86 (0.64–1.15)
Grandparents and other adults 22 0.93 (0.66–1.30)
Antiviral prescription for primary cases 150 0.81 (0.56–1.18)
Vaccination for primary cases 80 1.06 (0.89–1.27)
Absence interval of primary cases    
≤3 days 42 Ref.  
3 - 7 days 102 1.13 (0.91-1.40)
>7 days 17 1.74 (1.25-2.42)
  1. Note: Households where primary cases were primary shool or junior high school children were included in the analysis
  2. AF Acceleration factor,CI Confidence interval