condition mean min max ZT0-3 8.171565000000001 6.92976 9.41337 ZT4-7 13.05695 13.05695 13.05695 ZT8-11 10.602889999999999 10.602889999999999 10.602889999999999 ZT12-15 0 0 0 ZT16-19 14.3124 14.3124 14.3124 ZT20-23 14.88355 14.88355 14.88355