cribbage tournament, how is "score difference" calculated?

[Tonyiii]

In a cribbage tournament, how is the "score difference" calculated?
Whats the formula?

Image Link: https://photos.app.goo.gl/ZbRTbRLiFAyftDhv8

plain text paste...

Round robin
Players
Points Played Skipped Wins Draws Losses Score difference
1st
xxx 5 7 0 5 0 2 -8

2nd
yyy 4 5 0 4 0 1 68



Thanks and regards
Tony iii