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Fig. 2 | Arthritis Research & Therapy

Fig. 2

From: Reduced induction of anti-PF4/heparin antibody in RA patients after total knee arthroplasty

Fig. 2

Anti-PF4/heparin seroconversion rates and proportion of patients who tested strongly positive in patients who underwent TKA. Seroconversion rate and the proportion of patients who tested positive (ELISA values ≥ 0.4 optical density (OD) units) were calculated for patients receiving unfractionated heparin (UFH), low-molecular-weight heparin (LMWH), fondaparinux, or only mechanical thromboprophylaxis (no anticoagulant) after TKA. Each group was divided into two subgroups based on the primary diseases (RA or OA). The seroconversion rates were compared between the RA patients or OA patients in each group using the chi-square test. When the sample size of a cell in a 2 × 2 table was less than 10, Fisher’s exact test was used instead. p values were not corrected for multiple hypothesis tests. ELISA enzyme-linked immunosorbent assay, OA osteoarthritis, RA rheumatoid arthritis

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