Table 1.

Percent variation of test number between the year 2020 and the year 2019, per antibody and per country.

Country (no. laboratories)	Austria (4)	Belgium (4)	Croatia (4)	Estonia (2)	France (6)	Greece (7)	Hungary (8)	Italy (23)	Netherlands (6)	Norway (5)	Poland (3)	Portugal (1)	Spain (12)	Sweden (4)	Switzerland (8)	Total (97)
anti-dsDNA	2.7	−14.1	−24.7	9.8	−12.3	−27.6	−22.0	−18.6	−12.0	−10.7	−27.4	−6.7	−13.2	−6.1	−0.7	−14.3
MPO-ANCA	−4.7	−18.9	−32.9	−2.7	−3.1	−23.5	−20.8	−17.3	−13.3	−7.4	36.8	−9.9	−12.7	−4.1	0.0	−11.8
PR3-ANCA	−4.8	−19.1	−32.8	−2.3	−2.5	−19.2	−21.5	−15.3	−13.7	−7.2	−32.6	−12.5	−13.7	−4.1	−0.2	−12.2
ACPA	−6.8	−16.4	−21.6	−3.2	−5.4	−27.6	−24.3	−16.3	−6.3	−6.6	−12.6	2.9	−17.6	−3.5	−5.9	−12.8
RF IgM	−9.0	−16.1	−20.8	−6.0	−4.3	−28.9	−25.0	−21.1	−8.2	−5.6	−18.4	−7.2	−17.3	−0.1	−7.2	−14.8
aCL IgG	−4.2	−0.2	−19.5	4.9	0.8	−25.8	−22.5	−10.6	−3.0	−4.3	−11.7	0.5	−9.7	0.7	4.9	−10.0
aCL IgM	−15.1	9.1	−16.9	5.4	4.0	−25.8	−22.5	−11.1	−1.9	−5.8	−14.2	−1.0	−7.3	0.6	2.0	−10.2
anti-β2GPI IgG	−8.9	37.6	0.5	8.7	1.9	−21.6	−24.3	−10.0	−0.1	−3.6	4.4	6.8	3.0	3.5	6.7	−5.1
anti-β2GPI IgM	−12.6	31.5	−4.2	5.1	6.3	−21.6	−24.3	−10.5	15.3	−5.6	−6.4	5.1	2.4	4.4	6.8	−6.2
anti-tTG IgA	−14.7	−17.6	−27.3	−7.8	−17.7	−30.5	−22.7	−26.2	−16.6	−8.6	29.2	−5.1	−20.0	−5.5	−9.8	−16.1
Total	−6.5	−12.5	−22.5	−2.5	−4.4	−25.5	−23.0	−18.3	−10.4	−7.2	−7.5	−3.7	−14.7	−3.4	−1.4	−13.0

Abbreviations: ACPA, anti-citrullinated protein antibodies; ANCA, anti-neutrophil cytoplasmic antibodies; β2GPI, β2glycoprotein I; aCL, anti-cardiolipin; dsDNA, double stranded-DNA; MPO, myeloperoxidase; PR3, proteinase 3; RF, rheumatoid factor; tTG, tissue transglutaminase.