condition mean min max ZT0-3 12.637280639 8.843174753 16.431386525 ZT4-7 22.1295515275 21.568974994999998 22.69012806 ZT8-11 22.3630517425 21.35000266 23.376100825 ZT12-15 24.1137057775 17.137374215 31.090037340000002 ZT16-19 26.34049136 25.756335845000002 26.924646875 ZT20-23 23.609301942499997 21.750488609999998 25.468115275