Table 5. Disease severity based on the BSA and PASI score.

	N	%
Mean percentage of skin lesion on body surface area (SD)	17.94 ± 20.06
Mild	4884	42.7
Moderate	4652	40.6
Severe	1914	16.7
Mean PASI scores of skin lesion (SD)	18.70 ± 10.01
Mild	1736	15.3
Moderate	1532	13.5
Severe	8047	71.1

BSA, body surface area, grouped by mild (< 10%), moderate (10%∼30%), severe (> 30%).

PASI, Psoriasis Area and Severity Index, grouped by mild (< 8), moderate (8∼12), severe (> 12).