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

PsA Psoriatic Arthritis, PCA Principal Component Analysis, DAPSA Disease Activity for PSoriatic Arthritis, PASI Psoriasis Area Severity Index