Table 6.

PsA characteristics in EOP and LOP

Variables	Total patients (N = 160)	EOP (N = 121)	LOP (N = 39)	P
PsA, N (%)	41 (25.6)	33 (27.3)	8 (20.5)	0.057
Age at PsA onset, years	38.98 ± 11.64	37.0 ± 11.49	47.13 ± 8.77
mean±SD (range)	(10–71)	(10–63)	(37–71)	0.025
Duration between Ps and PsA, years	12.80 ± 11.46	15.72 ± 10.36	0.75 ± 7.36	-a, < 0,01b
mean±SD (range)	(15–34)	(1–34)	(1–15)
Active Ps duration in PsA patients with Rx, months	28.34 ± 9.2	34 ± 20.1	6 ± 8.3	0.761 a, 0.002 b
mean±SD
Active Ps duration in PsA patients without Rx, months	27.98 ± 10.3	33 ± 15.1	9 ± 18.1	0.803 a, < 0.0 b
mean±SD

EOP = early onset psoriasis; LOP = late onset psoriasis; Ps = psoriasis; PsA = psoriatic arthritis; Rx = systemic treatment; SD = standard deviation.

P^a: patients with psoriasis;

P^b: between EOP and LOP