Table 4 Main characteristics and distribution of US and CT abnormalities in patients with different subtypes of SLE arthropathy

Age, years (mean ± SD)

41.0 ± 5.7

61.3 ± 14.3

43.1 ± 16.4

0.001

0.765

0.035

Disease duration, years (mean ± SD)

13.7 ± 6.6

21.7 ± 10.7

10.8 ± 4.1

0.035

0.298

0.003

Rheumatoid factor

7 (77.8 %)

2 (20.0 %)

2 (28.5 %)

-

-

-

Anti-CCP

6 (66.7 %)

0 (0)

1 (14.2 %)

-

-

-

US erosion number (median (25th to 75^th percentile))

3.0 (1.7–4.2)

0.5 (0–2.0)

0 (0–1.0)

0.019

0.004

0.569

US quadrants with erosion

27 (10.7 %)

12 (4.3 %)

4 (2.0 %)

-

-

-

ScUSSe total (median (25th to 75^th percentile))

4.0 (2.5–6.0)

1.0 (0–3.0)

0 (0–1.0)

0.021

0.003

0.535

 Grade 1 (<2 mm)

16^a

10^a

4^a

-

-

-

 Grade 2 (2–3 mm)

9^a

1^a

0^a

-

-

-

 Grade 3 (>3 mm)

2^a

1^a

0^a

-

-

-

CT erosion number (mean ± SD)

14.0 ± 9.7

5.7 ± 5.1

4.7 ± 4.5

0.050

0.030

0.543

RAMRIS (mean ± SD)

21.6 ± 18.2

7.4 ± 7.0

5.1 ± 5.0

0.053

0.029

0.448

RAMRIS MCP (median (25th to 75^th percentile))

6.0 (4.5–10.2)

1.0 (0–2.0)

0 (0–1.5)

0.013

0.009

0.353

RAMRIS wrist (median (25th to 75^th percentile))

8.0 (10.2–16.2)

3.5 (0–11.0)

3.0 (0.5–6.7)

0.111

0.057

0.694

 Grade 1 (1–10 %)

24^a

21^a

6^a

-

-

-

 Grade 2 (11–20 %)

19^a

6^a

6^a

-

-

-

 Grade 3 − 10 (21–100 %)

7^a

1^a

2^a

-

-

-