Table 2.

Significant results of the multivariate conditional logistic regression.

Parameter	P	OR
Family history of dermatological disease	0.003	2.87
Personal thyroid diseases	0.04	0.4
Koebner	<0.001	4.73
Stress as onset factor	0.002	0.34
Personal ATD	0.003	0.23
Personal thyroid nodules	0.001	0.90