Table 6.

Family history of psoriasis and vitiligo among psoriatic patients in comparison with that of control

Variable	Psoriasis		Healthy control		χ2	df	P-value
	N	(%)	N	(%)
Family history of psoriasis
No	169	67.6	480	96.0	70.56	1	<0.001
Yes	81	32.4	20	4
Total	250	100	500	100.0
Family history of vitiligo
No	226	90.4	460	92.0	4.325	1	<0.05
Yes	24	9.6	40	8
Total	250	100	500	100.0