condition mean min max ZT0-3 4.279785 3.7037050000000002 4.855865 ZT4-7 4.878685 4.878685 4.878685 ZT8-11 2.32274 2.32274 2.32274 ZT12-15 0 0 0 ZT16-19 5.10294 5.10294 5.10294 ZT20-23 3.70563 3.70563 3.70563