condition mean min max ZT0-3 10.141265 10.141265 10.141265 ZT4-7 9.673011500000001 9.673011500000001 9.673011500000001 ZT8-11 8.834779999999999 8.834779999999999 8.834779999999999 ZT12-15 9.516817 9.516817 9.516817 ZT16-19 10.343784 10.343784 10.343784 ZT20-23 11.0664865 11.0664865 11.0664865