Table 2.

Comparison of lesion area before and after 5-ALA-PDT treatment

Number of lesions	Preoperative lesion area in cm2	Postoperative lesion area in cm2	Z	p
Statistically significant difference at p<0.05. Values in parentheses are 25th and 75th percentiles.
31	2.14 (1.55, 2.75)	0.15 (0.00, 0.3)	-4.86	<0.01