Table 3. Linear regression analysis identifying predictors of cutaneous psoriasis severity.

Variables		Univariable analysis		Multivariable analysis
		β	p	Adjusted β	p
Disease duration		0.04	0.364
Family history		−1.38	0.225
Clinical characteristics
	Scalp involvement	2.19	0.012	1.55	0.067
	Nail change	3.35	<0.001	2.92	<0.001
	Peripheral arthritis	0.31	0.777
	Axial arthritis	0.67	0.551
	Enthesopathy	3.07	0.081
Psoriatic arthritis		2.89	0.011	1.89	0.089
Laboratory parameters
	ESR	0.01	0.680
	RDW	−0.08	0.848
	CRP	0.03	0.728
	Negative RF*	2.52	0.193
	HLA-B27 positivity	−0.94	0.504	−1.18	0.384

ESR: erythrocyte sedimentation rate, RDW: red cell distribution width, CRP: C-reactive protein, RF: rheumatoid factor.

^*Negative RF was defined as <15 IU/ml.