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Table 1 Overview of dates for the COVID-19 surges in The Netherlands

From: Development and evaluation of regression tree models for predicting in-hospital mortality of a national registry of COVID-19 patients over six pandemic surges

Surge

From

To

1

1 February 2020

15 May 2020

0 (in between)

16 May 2020

30 September 2020

2

1 October 2020

1 December 2020

3

1 December 2020

31 January 2021

4

1 February 2021

1 July 2021

5

1 July 2021

30 September 2021

6

1 October 2021

23 November 2021