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Table 3 Cases and controls by age group, sex, month of swab collection, year and type/subtype, 2007-2008

From: Estimation of type- and subtype-specific influenza vaccine effectiveness in Victoria, Australia using a test negative case control method, 2007-2008

  2007 2008
  Controls Influenza cases (%) Controls Influenza cases (%)
  (%) All A/H1 A/H3 B (%) All A/H1 A/H3 B
Age group (years)           
   0-4 7 (4) 7 (4) 3 (7) 4 (3) 0 4 (2) 5 (5) 0 1 (3) 3 (5)
   5-19 22 (11) 42 (22) 12 (27) 24 (21) 6 (23) 37 (17) 28 (27) 0 6 (16) 22 (37)
   20-49 126 (66) 113 (58) 25 (56) 68 (58) 17 (65) 140 (63) 57 (54) 3 (75) 18 (47) 33 (56)
   50-64 28 (15) 22 (11) 4 (9) 14 (12) 2 (8) 30 (13) 11 (10) 1 (25) 9 (24) 1 (2)
   ≥ 65 9 (5) 10 (5) 1 (2) 7 (6) 1 (4) 13 (6) 4 (4) 0 4 (11) 0
Sex           
   Female 89 (46) 96 (49) 20 (44) 62 (53) 12 (46) 105 (47) 55 (52) 1 (25) 19 (50) 34 (57)
   Male 103 (54) 98 (51) 25 (56) 55 (47) 14 (54) 119 (53) 51 (48) 3 (75) 19 (50) 26 (43)
Month of swab collection           
   March 2 (1) 2 (1) 0 1 (< 1) 1 (4) 0 0 0 0 0
   April 5 (3) 1 (< 1) 0 1 (< 1) 0 6 (3) 0 0 0 0
   May 14 (7) 1 (< 1) 1 (2) 0 0 28 (13) 3 (3) 0 0 3 (5)
   June 13 (7) 4 (2) 1 (2) 3 (3) 0 33 (15) 3 (3) 0 0 3 (5)
   July 48 (25) 50 (26) 10 (22) 31 (27) 7 (27) 32 (14) 9 (8) 0 3 (8) 5 (8)
   August 66 (34) 94 (48) 30 (67) 56 (48) 4 (15) 69 (31) 42 (40) 4 (100) 17 (45) 21 (35)
   September 37 (19) 30 (15) 3 (7) 23 (20) 4 (15) 42 (19) 43 (41) 0 14 (37) 27 (45)
   October 7 (4) 12 (6) 0 2 (2) 10 (38) 13 (6) 6 (6) 0 4 (11) 1 (2)
   November 0 0 0 0 0 1 (< 1) 0 0 0 0
Total 192 194 45 117 26 224 106a 4 38 60a
  1. a Age unknown for one case