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Table 2 Efficacy and effectiveness of influenza vaccination according to different outcomes: crude results

From: The effect of giving influenza vaccination to general practitioners: a controlled trial [NCT00221676]

   VAC UNVAC RR 95% Cl
Number of GPs with a respiratory tract infection 2002 37/66 (56.1%) 21/35 (60%) 0.93 0.66 – 1.32
  2003 48/96 (50%) 19/40 (47.5%) 1.05 0.72 – 1.54
  2002–2003 85/162 (52.5%) 40/75 (53.3%) 0.98 0.76 – 1.27
Number of GPs with a respiratory tract infection and positive nose and throat swabs 2002 3/66 (4.5%) 2/35 (5.7%) 0.78 0.13 – 4.94
  2003 11/96 (11.5%) 9/40 (22.5%) 0.51 0.23 – 1.13
  2002–2003 14/162 (8.6%) 11/75 (14.7%) 0.59 0.28 – 1.24
Number of GPs with a respiratory tract infection and a 4-fold hemagglutination-inhibition antibody titre rise 2002 2/59 (3.4%) 4/33 (12.1%) 0.28 0.05 – 1.45
  2003 3/36 (8.3%) 9/36 (25%) 0.33 0.10 – 1.13
  2002–2003 5/95 (5.3%) 13/69 (18.8%) 0.28 0.10 – 0.75
Number of GPs with a respiratory tract infection and positive swab or 4-fold hemagglutination-inhibition antibody titre rise 2002 4/59 (6.8%) 6/33 (15.2%) 0.45 0.13 – 1.55
  2003 7/36 (19.4%) 13/36 (36.1%) 0.54 0.24 – 1.19
  2002–2003 11/95 (11.6%) 18/69 (26.1%) 0.44 0.22 – 0.88