condition mean min max ZT0-3 21.724224632500004 19.949504100000002 23.498945165000002 ZT4-7 16.567698399999998 15.88843614 17.24696066 ZT8-11 19.949346595 16.426222605 23.472470585000003 ZT12-15 19.817592995 18.119654914999998 21.515531075 ZT16-19 23.313021437499998 21.502782494999998 25.123260379999998 ZT20-23 24.62290979 24.00439037 25.24142921