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Table 1 Periods of data collection for KCL CHECK to week 18 (April – Aug 2020)

From: Indicators of recent COVID-19 infection status: findings from a large occupational cohort of staff and postgraduate research students from a UK university

 

Timepoint

Data collection period

P0 (Baseline)

P1

P2

P3

P4

P5

P6

P7

P8

Week of study

1–3

3–4

5–6

7–8

9–10

11–12

13–14

15–16

17–18

Month

April

May

 

June

  

July

 

Aug

Long survey

• "In the last two months"

x

   

x

   

x

Short survey

• "In the last two weeks"

 

x

x

x

 

x

x

x

 

Antibody test

     

x

  Â