Table 1.

The demographic characteristics of psoriasis, PsA and RA patients.

mean ± sd (min-max; median)	Psoriasis (n= 50)	PsA (n= 55)	RA (n= 50)	p
Age (year)	46.3 ± 1.7 (18–88; 45)	49.9 ± 1.3 (28–81; 51)	56.9 ± 1.4 (24–84; 56.5)	0.002*
Age at on set (year)	34.1 ± 15.4 (13–70; 31)	39.3 ± 11.8 (17–73; 40)	45.4 ± 13.1 (17–68; 46.5)	0.000*
Age of diagnosis (year)	34.7 ± 1.6 (13–70; 31)	40.9 ± 1.2 (17–73; 41)	48.4 ± 1.4 (19–77; 49.5)	0.000*
Mean psoriasis duration (year)	12.1 ± 11.8 (1–50; 8)	14.7 ± 10.2 (1–44; 13)	0	0.000*
Mean arthritis duration (year)	0	9.5 ± 8.0 (1–39; 7)	11.2 ± 8.2 (1–35; 10)	0.000*

sd: standart deviation; n: number; PsA: psoriatic arthritis; RA: rheumatoid arthritis.

^*p<0.05 is statistically significant