Table 2.

Differences between measured distances at the tumor margins in 17 different comparative images of the surgical field under both BLUE 400 and BLUE 400 AR filter system performed by 10 different experienced neurosurgeons. There was no statistical difference between the perceived fluorescent tumor margin under the BLUE 400 and the BLUE 400 AR filter system

N = 170	Border 1 (mm)	Border 2 (mm)
Mean	0.03	0.04
Median	0	0.1
Minimum	− 0.38	− 2.38
Maximum	0.75	1.13
95% CI	− 0.0016–0.0553	− 0.02–0.09