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Predictors of antibody response to two doses of COVID-19 vaccine, defined as postvaccination antibody levels over the cut-off (seropositivity) in seronegative patients or ≥ 4-fold increase in antibody levels in patients with seropositivity for both spike antigens. All 414 patients with inflammatory rheumatic diseases and 61 controls are included in the analysis. Unadjusted and adjusted odds ratios (OR) and 95 % CI are given.
