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Table 3 Comparison between distribution of gender and age in GIS and the Dutch population

From: Internet-based monitoring of influenza-like illness (ILI) in the general population of the Netherlands during the 2003–2004 influenza season

  Males (%)   Females (%)  
Age GIS DP R (CI) GIS DP R (CI)
0–10 2.8 14.6 0.15 (0.13–0.18) 2.8 14.4 0.16 (0.14–0.19)
11–20 7.9 12.2 0.60 (0.55–0.65) 10.7 11.6 0.90 (0.83–0.97)
21–30 11.1 12.8 0.88 (0.81–0.95) 14.4 11.8 1.22 (1.15–1.31)
31–40 17.4 16.7 1.09 (1.02–1.16) 19.9 15.4 1.36 (1.29–1.45)
41–50 22.2 14.5 1.54 (1.45–1.64) 22.8 13.8 1.69 (1.59–1.78)
51–60 22.2 12.7 1.77 (1.67–1.88) 17.2 12.2 1.35 (1.27–1.44)
61–70 11.1 8.9 1.27 (1.17–1.37) 9.9 9.0 1.12 (1.04–1.21)
71–80 4.7 5.5 0.85 (0.76–0.95) 2.1 7.1 0.29 (0.24–0.33)
>80 0.6 2.1 0.29 (0.21–0.39) 0.2 4.7 0.04 (0.02–0.06)
  1. GIS: Great Influenza Survey 2003–2004 (Males: n = 6,250; Females: n = 7,050)
  2. DP: Dutch population (data from Dutch Statistics; Males: n = 8,065,000; Females: n= 8,234,000)
  3. R: Ratio
  4. CI: 95% confidence interval (Calculated according to Gardner and Altman (ref. 28)