condition mean min max ZT0-3 304.375673 304.375673 304.375673 ZT4-7 247.5914165 247.5914165 247.5914165 ZT8-11 286.5069195 286.5069195 286.5069195 ZT12-15 340.1429425 340.1429425 340.1429425 ZT16-19 359.13231199999996 359.13231199999996 359.13231199999996 ZT20-23 380.66235700000004 380.66235700000004 380.66235700000004