condition mean min max ZT0-3 2.303835 1.3722750000000001 3.2353949999999996 ZT4-7 3.568885 3.568885 3.568885 ZT8-11 6.724975000000001 6.724975000000001 6.724975000000001 ZT12-15 0 0 0 ZT16-19 9.43965 9.43965 9.43965 ZT20-23 5.825695 5.825695 5.825695