condition mean min max ZT0-3 87.924485 87.924485 87.924485 ZT4-7 38.8351855 38.8351855 38.8351855 ZT8-11 43.4121285 43.4121285 43.4121285 ZT12-15 86.09992600000001 86.09992600000001 86.09992600000001 ZT16-19 206.864696 206.864696 206.864696 ZT20-23 154.04814 154.04814 154.04814