Fig 1.
Selection of the exposed population.
Table 1.
Characteristics of the COVID-19 episode.
Table 2.
Characteristics of the matched populations.
Fig 2.
Kaplan-Meier curves of the survival without flare among the matched populations.
P value was calculated with the log rank test.
Fig 3.
C3 levels and anti-dsDNA IgG titers.
C3 levels after index date in the matched populations (upper panel). Anti-dsDNA IgG titers after index date among patients positive for anti-dsDNA autoantibodies (lower panel) in the matched populations. Lines represent the fitted LOESS model with its confidence interval. A log10 scale is used for the Y axis in the lower panel.
Table 3.
Factors associated with the occurrence of a flare or death during follow-up.