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A comment on Brain imaging before and after Covid-19 in UK Biobank. Parent comment

Re:Brain imaging before and after Covid-19 in UK Biobank by ekianjo on Sunday June 20, 2021 @12:16PM (#27571484)
> Our general approach in this study was therefore as follows: (i) utilise brain imaging data from 782 participants who have visited the UKB imaging centres for two scanning sessions, on average 3 years apart, with 394 of these having contracted COVID-19 in between their two scans;

Have they established with certainty that in the control group there were no-one with COVID19 infection in the first place?

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Re:Brain imaging before and after Covid-19 in UK Biobank by olaulaja on Sunday June 20, 2021 @03:25PM (#27573118)
Having a few false negatives in the control group shouldn't really matter since that would only make the groups more similar and hide any differences that exist rather than hallucinating ones that don't.
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