Table 4 Difference between structural damage and the presence/absence of HLA-B27 on the SPARCC scores or ASDAS-CRP level in nr-axSpA subjects (Mann–Whitney U test)

SPARCC scores

 Sclerosis ( +) vs. (–)

p value

5.77 vs. 0.67

0.002**

2.62 vs. 0.25

0.161

3.98 vs. 0.40

 < 0.001***

 Erosion ( +) vs. (–)

p value

3.90 vs. 0.00

NA^c

1.62 vs. 0.50

1

2.57 vs. 0.50

0.663

 JSW ( +) vs. (–)

p value

8.58 vs. 1.97

 < 0.001***

6.36 vs. 0.51

0.005**

7.52 vs. 1.04

 < 0.001***

 DP^a ( +) vs. (–)

p value

4.19 vs. 3.36

0.734

1.90 vs. 0.91

0.422

2.82 vs. 1.86

0.942

 TP^b ( +) vs. (–)

p value

8.58 vs. 1.97

0.001**

6.90 vs. 0.52

0.005**

7.82 vs. 1.04

 < 0.001***

ASDAS-CRP scores

 Sclerosis ( +) vs. (–)

p value

2.04 vs. 2.02

0.678

2.09 vs. 2.03

1

2.04 vs. 2.06

0.848

 Erosion ( +) vs. (–)

p value

2.03 vs. 0.00

NA

2.23 vs. 2.04

0.308

2.23 vs. 2.04

0.270

 fJSW ( +) vs. (–)

p value

2.38 vs. 1.89

0.034*

2.31 vs. 2.00

0.074

2.34 vs. 1.96

0.010*

 DP^a ( +) vs. (–)

p value

2.18 vs. 1.76

0.108

2.14 vs. 1.91

0.199

2.15 vs. 1.85

0.050

 TP^b ( +) vs. (–)

p value

2.38 vs. 1.89

0.034*

2.27 vs. 2.02

0.173

2.33 vs. 1.97

0.020*