Table 2.

Sociodemographic, clinical, laboratory, and imaging features of patients with final diagnosis of PsA and their comparison with both patients with diagnosis other than PsA and patients with final diagnosis of rheumatoid arthritis

	Psoriatic Arthritis, n = 88	Diagnosis Other Than Psoriatic Arthritis, n = 967	P	Rheumatoid Arthritis, n = 190	P
Age (years), mean (SD)	50.4 (12.6)	53 (14.4)	.09	56.1 (13.6)	.001
Female, %	56.8	77.9	<.0001	72.1	.01
Time between the onset of symptoms and the baseline visit (months), mean (SD)	55.2 (64.3)	26.2 (36.5)	<.0001	30.5 (47.6)	.0005
Family psoriasis, %	26.1	4.8	<.0001	4.4	<.0001
Cutaneous psoriasis, %	70.9	1.9	<.0001	1.6	<.0001
Patient global VAS (0-100), mean (SD)	56.8 (23.1)	50.2 (20.3)	.01	55.3 (20.7)	.64
Tender joints (28), mean (SD)	2.8 (2.6)	3.5 (3.6)	.11	5 (3.7)	<.0001
Swollen joints (28), mean (SD)	1.5 (2.1)	0.6 (1.5)	<.0001	1.7 (2.5)	.50
ESR, mean (SD)	21.3 (17.4)	20 (17.2)	.49	29.2 (24.8)	.008
CRP, mean (SD)	5.4 (6.6)	4.6 (13.4)	.59	10.7 (22.5)	.03
DAS28-ESR, mean (SD)	3.4 (1.2)	3.3 (1.1)	.67	4.1 (1.2)	.0001
CDAI, mean (SD)	14.1 (7.2)	12.8 (7.2)	.17	17.4 (8)	.003
HAQ, mean (SD)	0.7 (0.4)	0.7 (2.6)	.97	1.3 (5.8)	.31
Rheumatoid factor, %	11.4	21.9	.05	66.4	<.0001
ACPAs, %	2.2	9.9	.09	41.7	<.0001
X-ray bone erosions, %	39.2	7.7	<.0001	18.1	.0003
Ultrasound synovitis with positive power Doppler signal, %	33.7	5.2	<.0001	22.9	.06

SD, standard deviation; VAS, visual analog scale; ESR, erythrocyte sedimentation rate; CRP, C-reactive protein; DAS28-ERS, Disease Activity Index in 28 joints-erythrocyte sedimentation rate; CDAI, Clinical Disease Activity Index; HAQ-DI, Health Assessment Questionnaire-Disability Index; ACPAs, anticitrullinated protein antibodies.