condition mean min max ZT0-3 25.521968237499998 24.135419015 26.90851746 ZT4-7 22.728806155 22.21470523 23.242907080000002 ZT8-11 17.405058150000002 15.049302565000001 19.760813735 ZT12-15 20.9142209375 19.045471655 22.782970220000003 ZT16-19 41.770229635 36.31645802 47.22400125 ZT20-23 40.332447730000005 37.287195280000006 43.377700180000005