Table 2.

The frequency of psoriasis in vitiligo patients and healthy controls

Psoriasis	Vitiligo		Healthy control		χ2	df	P-value
	N	%	N	%
Yes	15	6.0	2	0.4	23.5	1	<0.001
No	235	94.0	498	99.6
Total	250	100.0	500	100.0