condition mean min max ZT0-3 34.23495 34.23495 34.23495 ZT4-7 21.02645 21.02645 21.02645 ZT8-11 27.708199999999998 27.708199999999998 27.708199999999998 ZT12-15 29.01575 29.01575 29.01575 ZT16-19 41.893299999999996 41.893299999999996 41.893299999999996 ZT20-23 43.314949999999996 43.314949999999996 43.314949999999996