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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