condition mean min max ZT0-3 1.9913259617500003 1.2712983340000001 2.7113535895000003 ZT4-7 2.10451497825 1.8706342464999999 2.3383957100000003 ZT8-11 3.05383257675 2.6112131645 3.496451989 ZT12-15 5.14869634225 3.6312917534999998 6.666100931000001 ZT16-19 9.46128759175 8.3079298085 10.614645375 ZT20-23 12.624611269999999 12.33100442 12.91821812