condition mean min max ZT0-3 1.02346 1.02346 1.02346 ZT4-7 1.23432 1.23432 1.23432 ZT8-11 0.89538 0.89538 0.89538 ZT12-15 1.0921505 1.0921505 1.0921505 ZT16-19 3.7728099999999998 3.7728099999999998 3.7728099999999998 ZT20-23 0.8550873333333333 0.8550873333333333 0.8550873333333333