condition mean min max ZT0-3 4.2390803859999995 3.612746134 4.865414638 ZT4-7 2.3427195442500004 2.2515234165 2.4339156720000004 ZT8-11 2.4248372557500004 2.3606845635000004 2.4889899480000004 ZT12-15 1.4027670537499999 1.1583769875 1.64715712 ZT16-19 1.118971605 1.055148555 1.182794655 ZT20-23 1.88858234775 1.873755554 1.9034091415