Table 1.

Demographic features of patients with psoriasis and psoriatic arthritis

Parameter	Patients without arthritis (N = 41)		Patients with arthritis (N = 116)		Control group (n = 90)		P-value
	n	%	n	%	n	%
Gender:
Female	19	46.3	68	58.6	55	61.1	0.276*
Male	22	53.6	48	41.4	35	38.9
Family history of psoriasis:
Present	6	25.0	28	32.2			0.499*
Absent	18	75.0	59	67.8
	Mean ± SD	Median (min.–max)	Mean ± SD	Median (min.–max)	Mean ± SD	Median (min.–max)
Mean age	37.66 ±14.63	36 (9–66)	47.53 ±14.03	49 (12–85)	40.70 ±14.16	38 (18–81)	< 0.001**
Psoriasis duration	16.53 ±11.98	17 (1–35)	13.45 ±11.41	10 (1–55)	NA	NA	0.401***
PASI score	12.48 ±8.39	10.80 (2.90–35.20)	9.93 ±5.80	8.50 (1.20–27.00)	NA	NA	0.400***
Psoriasis onset age	24.47 ±16.52	19 (5–62)	35.43 ±15.97	35 (7–80)	NA	NA	0.001***

^*Pearson χ²

^**one-way ANOVA

^***Mann-Whitney U test.