child befrat afterrat absdiff signrank change
1 19 11 8 -10 -8
2 14 15 1 1 1
3 20 17 3 -3.5 -3
4 6 12 6 8 6
5 12 8 4 -5 -4
6 4 9 5 6.5 5
7 10 7 3 -3.5 -3
8 13 6 7 -9 -7
9 15 10 5 -6.5 -5
10 9 11 2 2 2