condition mean min max ZT0-3 1.922035 1.866235 1.978075 ZT4-7 1.4037549999999999 1.4037549999999999 1.4037549999999999 ZT8-11 1.90568 1.90568 1.90568 ZT12-15 1.98494 1.6507399999999999 2.31914 ZT16-19 1.601365 1.601365 1.601365 ZT20-23 1.9879149999999999 1.9879149999999999 1.9879149999999999