condition mean min max ZT0-3 38.644575 38.3959 38.89325 ZT4-7 46.75235 46.75235 46.75235 ZT8-11 39.32855 39.32855 39.32855 ZT12-15 0 0 0 ZT16-19 31.962600000000002 31.962600000000002 31.962600000000002 ZT20-23 35.5303 35.5303 35.5303