Table 3 Comparison of PsA patients stratified by median contribution to components of PCA

Component 1

≥ median contribution (0.708)

< median contribution (0.708)

p-value

 Age

51.70 (45.40-60.10)

51.30 (45.00-62.80)

0.573

 Disease duration, years

9.50 (1.92-15.71)

2.67 (1.92-5.21)

0.004

 DAPSA

37.20 (25.80-42.10)

24.90 (19.15-36.40)

0.014

 PASI

0.85 (0.00-3.60)

1.50 (0.40-3.15)

0.355

 Dactylitis

0.00 (0.00-0.00)

0.00 (0.00-0.00)

0.948

 Enthesitis

5.00 (3.00-7.00)

1.00 (0.00-3.00)

<0.001

 Nail psoriasis

0.50 (0.00-6.00)

4.00 (1.00-8.00)

0.025

Component 2

≥ median contribution (0.713)

< median contribution (0.713)

p-value

 Age

51.20 (40.80-60.55)

51.70 (45.40-61.50)

0.5809

 Disease duration, years

3.00 (1.00-8.13)

5.83 (2.29-15.21)

0.039

 DAPSA

32.30 (22.35-41.25)

28.90 (19.73-39.30)

0.418

 PASI

1.05 (0.00-3.55)

1.20 (0.00-2.95)

0.990

 Dactylitis

0.00 (0.00-1.00)

0.00 (0.00-0.00)

0.521

 Enthesitis

3.00 (1.00-5.00)

3.00 (1.00-5.00)

0.749

 Nail psoriasis

2.00 (0.00-5.00)

4.00 (0.00-8.00)

0.215

Component 3

≥ median contribution (0.655)

< median contribution (0.655)

p-value

 Age

50.50 (42.40-59.20)

54.10 (46.40-62.10)

0.192

 Disease duration, years

4.00 (2,13-10.00)

3.42 (1.00-12.13)

0.530

 DAPSA

32.30 (23.45-39.70)

26.20 (20.93-41.15)

0.653

 PASI

1.30 (0.00-3.23)

1.20 (0.00-3.00)

0.765

 Dactylitis

0.00 (0.00-0.00)

0.00 (0.00-1.00)

0.569

 Enthesitis

3.00 (0.00-5.00)

3.00 (1.00-6.00)

0.749

 Nail psoriasis

3.00 (0.00-7.00)

3.00 (0.00-7.00)

0.978

Component 4

≥ median contribution (0.579)

< median contribution (0.579)

p-value

 Age

51.70 (45.00-61.05)

51.30 (46.40-61.00)

0.846

 Disease duration, years

3.42 (1.54-10.00)

4.00 (1.58-13.13)

0.703

 DAPSA

31.05 (21.25-41.42)

29.00 (21.90-38.55)

0.824

 PASI

0.85 (0.00-1.58)

2.00 (0.20-5.00)

0.046

 Dactylitis

0.00 (0.00-0.00)

0.00 (0.00-0.00)

0.935

 Enthesitis

3.00 (0.00-5.00)

3.00 (1.00-5.00)

0.767

 Nail psoriasis

3.00 (1.00-8.00)

1.00 (0.00-5.00)

0.191