condition mean min max ZT0-3 9.8057 9.302465 10.308935 ZT4-7 4.40397 4.40397 4.40397 ZT8-11 3.115565 3.115565 3.115565 ZT12-15 0 0 0 ZT16-19 7.718885 7.718885 7.718885 ZT20-23 6.771335 6.771335 6.771335