Table 2.

Characteristics of national retrospective cohorts and status of data collection, as of 30 Nov. 2022.

Country Age N° of Start End Cohort size
(Y) hospitals accrual & follow-up Accrual Follow-up Collected locally Expected
Belgium 0–18 3 2004 2020 2020 2841 6000
France 0–16 15 2000 2020 2016 18 600 19 000
Germany 0–18 2 2004 2020 2020 4000
0–18 Insurance claims 2004 2020 2020 20 000
Italy 0–18 2 2017 2021 2022 384 1000
Norway 0–18 1 1975 2022 2022 5400 6500
Spain 0–18 2 to 2 2005 2022 2021 None 5000
UK 0–22 6 1991 2020 2020 20 464 30 000
47 000 90 000

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