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We conducted a survey in which a self-report questionnaire was mailed to
eligible patients who had recovered from COVID-19 in April 2021 with two
reminders 2 weeks and 1 month later. Potential participants were
recruited from patients who had recovered from COVID-19 and visited the
outpatient service of the Disease Control and Prevention Center (DCC) in
the NCGM in order to obtain pre-donation screening test for COVID-19
convalescent plasmapheresis (Another study named “Collection and
antibody measurement of Convalescent plasma foreseeing the use for
COVID-19 treatment”). 530 patients who had recovered from COVID-19 (70
out of 448 needs supplementary oxygen support) and visited the
outpatient service of the Disease Control and Prevention Center (DCC) in
National Center for Global Health and Medicine (NCGM), Tokyo, Japan from
1st February 2020 to 31st March
2021. Participation in the survey was voluntary and not anonymous.
Participants were requested to complete and return the questionnaire.
457 of 530 (86.2%) patients completely answered the questionnaire and
were included in the analysis.