Table 4.

This table shows number of tributaries identified by each measurement method.

TUS: Number of GSV tributaries	Intra-operative observation: Number of GSV tributaries	Mean of both methods	Difference between both methods
11	13	12	-2
12	12	12	0
10	10	10	0
14	15	14.5	-1
8	15	11.5	-7
9	10	9.5	-1
6	6	6	0
10	15	12.5	-5
2	5	3.5	-3
7	10	8.5	-3
Total = 89	Total = 111		Mean difference = -2.1