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Table 1 Timeframes for each questionnaire

From: Informatics assessment of COVID-19 data collection: an analysis of UK Biobank questionnaire data

Time Period

Date Range

T1

mid-March through June 2020

T2

July through mid-September 2020

T3

mid-September through October 2020

T4

November through December 2020

W1-6

May through December 2020

W7

November 2021 through March 2022