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Table 3 The characteristics of epidemiological factors observed in primary cases between with and without household transmission events

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

  Cases with household influenza transmission (N = 114) Cases without household influenza transmission (N = 198) P value
Median onset month January 2013 January 2013 0.052
Median age of primary cases (range) 11 (6–15) 12 (6–15) 0.01
Antiviral treatment for primary cases (%) 107 (93.9) 189 (95.5) 0.61
Influenza vaccination (%) 90 (45.3) 107 (42.7) 0.79
Median absent days (range) 4.5 (0–10) 4 (0–14) 0.009
  1. Note: Primary cases only included primary school and junior high school children