condition mean min max ZT0-3 9.674495 9.674495 9.674495 ZT4-7 2.765385 2.765385 2.765385 ZT8-11 8.693725 8.693725 8.693725 ZT12-15 70.35164999999999 70.35164999999999 70.35164999999999 ZT16-19 54.47065 54.47065 54.47065 ZT20-23 23.1557 23.1557 23.1557