Table 4. Risk factors for severe alopecia areata.

Characteristic	Multivariable analysis			Multivariable analysis
	OR	95% CI	p-value	OR	95% CI	p-value
Sex (male/female)	1.637	1.232~2.175	<0.001*	1.726	1.282~2.325	<0.001*
Nail change (present/absent)	4.245	2.494~7.225	<0.001*	4.104	2.357~7.146	<0.001*
Thyroid disease (present/absent)	2.056	1.285~3.290	0.003*	3.501	0.943~13.001	0.061
Autoimmune disease (present/absent)	1.586	1.026~2.449	0.038*	0.604	0.176~2.007	0.423
Duration (≥1 year/<1 year)	2.567	1.926~3.420	<0.001*	2.405	1.791~3.229	<0.001*

OR: odds ratio, 95% CI: 95% confidence interval. ^*p-value <0.05 was considered statistically significant.