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Table 1 Numbers of patients and infection rates among schoolchildren, university students, and staff.

From: Swine-Origin Influenza A Outbreak 2009 at Shinshu University, Japan

Group District Subgroup Subjects Patients % Male%   Female%
Schoolchildren       
  A Kindergarten 122 43 35.2 39.7 / 31.3
   Elementary school 422 228 54.0 54.5 / 53.6
   Junior high school 464 212 45.7 50.5 / 41.4
  F Elementary school 598 202 33.8 34.3 / 33.3
   Junior high school 657 228 34.7 34.0 / 35.4
   Special education school 55 8 14.5 8.8 / 23.8
   Incomplete   7     
   Total (Average) 2318 928 (40.0)* (40.5 / 39.0)
University students       
  A Freshmen 2301 357 15.5 17.3 / 14.1
   Arts 601 28 4.7 5.5 / 4.2
   Economics 865 49 5.7 4.7 / 7.0
   Science 933 51 5.5 5.2 / 6.1
   School of Medicine 1136 70 6.2 6.4 / 4.6
  B Engineering 2417 105 4.3 4.8 / 2.0
  C Textile Science and Technology 1417 149 10.5 9.7 / 13.1
  D Education 1005 101 10.0 10.2 / 9.9
  E Agriculture 749 93 12.4 13.2 / 12.5
   Incomplete   13     
   Total (Average) 11424 1016 (8.9)* (8.7 / 9.2)
Staff         
  A   2443 30 1.2 1.3 / 1.1
  B   284 1 0.4 0.4 / 0.0
  C   233 10 4.3 2.0 / 7.0
  D   143 3 2.1 3.0 / 0.0
  E   135 5 3.7 3.9 / 6.5
  F   106 9 8.5 7.2 / 11.4
   Total (Average) 3344 58 (1.7)* (1.6 / 1.7)
All subjects Total (Average) 17086 2002 (11.7) (10.9 / 12.5)
  1. * χ2 test (P < 0.0001)
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