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Table 1 Vaccination rates in school-located seasonal influenza vaccination (SLV-I) schools and control schools during Year 1 (2009–2010 season) and Year 2 (2010–2011 season)

From: Cost effectiveness analysis of Year 2 of an elementary school-located influenza vaccination program–Results from a randomized controlled trial

  Year 1 (2009–2010)a Year 2 (2010–2011)
  SLV-I schools Control schools Difference between SLV-I and Controlb SLV-I schools Control schools Difference between SLV-I and Controlb
  Students % Total Students Students % Total Students Students % Total Students Students % Total Students
TOTAL STUDENTS 9,027 100 % 4,534 100 % 0 % 9,145 100 % 4,796 100 % 0 %
Not vaccinated 5,356 59.3 % 3,195 70.5 % −11.2 % 6,486 59.6 % 3,432 71.6 % −12.0 %
Total vaccinated 3,671 40.7 %* 1,339 29.5 %* 11.2 %d*** 3,698 40.4 %** 1,364 28.4 %** 12.0 %d***
 Vaccinated elsewherec 2,474 27.4 % 1,339 29.5 % −2.1 % 2,659 29.1 % 1,364 28.4 % 0.6 %
 Vaccinated at SLV-I 1,197 13.3 %c n/a n/a 13.3 % 1,039 11.4 % n/a n/a 11.4 %
  1. n/a: not applicable
  2. a: Only first clinics at each SLV-I school (excluding the vaccinated children at the second vaccination clinics (2.0 % among all students in Year 1))
  3. b: The differences in the proportion between the column of “SLV-I schools (% Total Students)” and “Control schools (% Total Students)”
  4. c: Identified as receiving at least the 1st dose outside the SLV-I schools in the New York State Immunization Information System (NYSIIS)
  5. d: Primary effectiveness measure included in our cost-effectiveness analysis model
  6. *: 40.7 % was significantly greater than 29.5 % (p-value < 0.0001) in Year 1
  7. **: 40.4 % was significantly greater than 28.4 % (p-value < 0.0001) in Year 2
  8. ***: Primary effectiveness: 11.2 % in Year 1 was marginally smaller than 12.0 % in Year 2 (p-value = 0.092)