Table 3.

ETDRS

BCVA (by ETDRS)	Median ETDRS	Interquartile range	Significance
Before treatment	72.50	65.00, 78.75
1 month after PDT	75.00	67.50, 83.50
3 months after PDT	72.50	65.00, 85.00
6 months after PDT	75.00	70.00, 85.00	0.065#

Notes: p-value, comparison with before treatment.

^#Continuity for the distribution of the paired differences was not given, and therefore a sign test was performed.

Abbreviations: BCVA, best corrected visual acuity; ETDRS, Early Treatment Diabetic Retinopathy Study; PDT, photodynamic therapy.