condition mean min max ZT0-3 0.054961208 0.0 0.109922416 ZT4-7 0.58428063925 0.3866458225 0.781915456 ZT8-11 1.9143564687499999 1.2482193879999999 2.5804935495 ZT12-15 3.6951042404999996 3.1014881825 4.2887202984999995 ZT16-19 3.9393291157499997 3.753919403 4.1247388285 ZT20-23 2.1369717030000004 2.0753124300000003 2.198630976