condition mean min max ZT0-3 3.57225261525 1.7206913814999998 5.423813849 ZT4-7 1.7817035605 1.2489551645 2.3144519565 ZT8-11 3.1901603245 2.9250217359999997 3.455298913 ZT12-15 1.7542112279999997 1.2888070209999998 2.2196154349999997 ZT16-19 1.60310751725 1.3335601525 1.872654882 ZT20-23 2.01262224125 1.9099851365 2.1152593459999998