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Table 2 Influenza-related hospitalizations per 100,000 inhabitants in the 2017/2018 influenza epidemic in the Netherlands

From: Why crowding matters in the time of COVID-19 pandemic? - a lesson from the carnival effect on the 2017/2018 influenza epidemic in the Netherlands

Daya Cumulative Casesb Absolute rate differencec
(95% CI)
Rate ratioc
(95% CI)
Non-carnival region Carnival region
2018/01/28 17.94 18.54 0.60 (− 0.81–2.06) 1.03 (0.96–1.12)
2018/01/29 18.79 19.65 0.86 (− 0.60–2.35) 1.05 (0.97–1.13)
2018/01/30 19.55 20.51 0.96 (−0.53–2.48) 1.05 (0.97–1.13)
2018/01/31 20.49 21.43 0.95 (− 0.57–2.50) 1.05 (0.97–1.12)
2018/02/01 21.21 22.32 1.11 (− 0.44–2.69) 1.05 (0.98–1.13)
2018/02/02 22.31 23.32 1.01 (− 0.58–2.63) 1.05 (0.97–1.12)
2018/02/03 22.92 24.06 1.14 (− 0.47–2.78) 1.05 (0.98–1.12)
2018/02/04 23.49 24.66 1.17 (− 0.46–2.83) 1.05 (0.98–1.12)
2018/02/05 24.46 25.91 1.45 (−0.22–3.16) 1.06 (0.99–1.13)
2018/02/06 25.18 26.83 1.65 (−0.04–3.38) 1.07 (1.00–1.14)
2018/02/07 26.03 27.59 1.57 (− 0.15–3.32) 1.06 (0.99–1.13)
2018/02/08 26.90 28.64 1.74 (−0.02–3.53) 1.06 (1.00–1.13)
2018/02/09 27.96 29.63 1.67 (−0.12–3.49) 1.06 (1.00–1.13)
2018/02/10 28.65 30.49 1.84 (0.03–3.68) 1.06 (1.00–1.13)
2018/02/11d 29.48 31.31 1.83 (0.00–3.70) 1.06 (1.00–1.13)
2018/02/12d 30.69 32.25 1.57 (−0.30–3.46) 1.05 (0.99–1.11)
2018/02/13d 31.69 33.44 1.76 (−0.14–3.69) 1.06 (1.00–1.12)
2018/02/14 32.64 34.70 2.06 (0.13–4.03) 1.06 (1.00–1.13)
2018/02/15 33.86 35.97 2.11 (0.15–4.11) 1.06 (1.00–1.12)
2018/02/16 34.90 37.39 2.49 (0.49–4.53) 1.07 (1.01–1.13)
2018/02/17 35.95 38.27 2.32 (0.30–4.39) 1.06 (1.01–1.12)
2018/02/18 36.76 39.75 2.99 (0.93–5.09) 1.08 (1.02–1.14)
2018/02/19 38.03 41.59 3.57 (1.46–5.71) 1.09 (1.04–1.15)
2018/02/20 39.14 43.48 4.35 (2.20–6.53) 1.11 (1.06–1.17)
  1. Abbreviation: CI Confidence interval
  2. a Only 2 weeks before and 1 week after the carnival in 2018 are presented, full presentation of all the available data can be found in Table S4
  3. b Cumulative cases of influenza-related hospitalizations per 100,000 inhabitants
  4. c Compared with non-carnival region
  5. d Carnival period