Table 4 Univariate logistic and, when appropriate, linear regressions of the association between MRI patterns and axSpA diagnosis, anatomical sacroiliac joint variations, gender, childbirths, age and body mass index. Odds radios (confidence intervals) if other not stated

Unilateral BME

0.6 (0.2–1.8)

0.5 (0.2–1.3)

0.6 (0.2–1.4)

0.6 (0.2–1.7)

1.0 (0.3–3.2)

1.8 (0.7–5.1)

0.5 (0.2–1.5)

1.4 (0.6–3.6)

0.0 (− 2.7–2.7)

− 1.1 (− 3.2–0.9)

Bilateral BME

2.0 (0.7–5.8)

1.4 (0.5–3.4)

1.6 (0.7–4.1)

2.0 (0.8–5.4)

1.2 (0.4–3.9)

0.4 (0.2–1.1)

1.5 (0.6–3.7)

0.8 (0.3–1.9)

− 0.8 (− 3.5–1.8)

1.5 (− 0.4–3.5)

Unilateral FMD

0.6 (0.2–2.1)

0.3 (0.1–1.0)

0.8 (0.3–2.3)

6.4 (2.0–20.5)*

2.8 (0.9–9.2)

1.1 (0.3–3.6)

0.1 (0.0–0.6)*

3.8 (1.2–11.8)*

0.9 (− 2.1–4.0)

− 0.6 (− 2.9–1.7)

Bilateral FMD

4.8 (1.8–13.1)*

1.4 (0.6–3.5)

0.8 (0.3–1.9)

0.8 (0.3–2.0)

0.8 (0.3–2.7)

0.5 (0.2–1.4)

1.6 (0.7–4.1)

1.0 (0.4–2.6)

− 0.8 (− 3.4–1.8)

1.9 (− 0.1–3.9)

Unilateral sclerosis

0.6 (0.2–2.1)

1.4 (0.5–4.1)

1.5 (0.5–4.4)

1.4 (0.5–4.0)

1.3 (0.4–4.6)

0.1 (0.0–1.0)

0.1 (0.0–0.6)*

2.0 (0.7–5.8)

− 1.7 (− 4.8–1.3)

− 0.8 (− 3.1–1.6)

Bilateral sclerosis

1.4 (0.4–4.3)

0.7 (0.2–2.0)

2.6 (0.8–8.9)

1.6 (0.5–4.7)

3.1 (0.9–10.3)

0.5 (0.1–2.1)

0.2 (0.1–0.9)*

4.8 (1.4–16.3)*

1.2 (− 2.9–4.3)

2.2 (− 0.1–4.5)

Unilateral erosion(s)

2.6 (0.9–7.9)

0.3 (0.1–1.1)

1.0 (0.3–2.8)

2.2 (0.7–6.3)

1.4 (0.4–5.1)

0.5 (0.1–2.1)

0.2 (0.1–0.9)*

1.8 (0.6–5.1)

− 0.5 (− 3.7–2.6)

− 1.1 (− 3.5–1.3)

Bilateral erosion(s)

5.9 (2.0–17.4)*

1.5 (0.5–4.0)

1.0 (0.4–2.9)

0.6 (0.2–1.8)

0.4 (0.1–1.9)

0.2 (0.1–1.2)

2.2 (0.8–6.0)*

0.9 (0.3–2.4)

− 1.3 (− 4.2–1.6)

1.2 (− 1.0–3.4)

Ligamentary BME

7.0 (2.5–19.6)*

1.9 (0.8–4.8)

2.8 (1.0–7.6)*

0.9 (0.3–2.2)

1.3 (0.4–3.9)

0.4 (0.1–1.2)

1.4 (0.6–3.6)

1.2 (0.5–2.9)

1.3 (− 1.4–3.9)

1.4 (− 0.6–3.4)

BME depth

5.9 (2.1–16.3)*

0.7 (0.3–1.8)

1,2 (0.5–3.2)

3.7 (1.4–9.7)*

1.0 (0.3–3.1)

0.4 (0.1–1.3)

1.0 (0.4–2.6)

0.8 (0.4–2.1)

0.2 (− 2.5–2.9)

0.0 (− 1.1–3.1)

FMD depth

4.7 (1.7–13.1)*

1.2 (0.5–3.1)

2.0 (0.7–5.5)

1.6 (0.6–4.1)

0.8 (0.2–2.8)

0.3 (0.1–1.2)

1.4 (0.5–3.5)

0.9 (0.4–2.3)

0.1 (− 2.7–2.9)

1.0 (− 1.1–3.1)