condition mean min max ZT0-3 834.8499999999999 834.8499999999999 834.8499999999999 ZT4-7 906.8 906.8 906.8 ZT8-11 742.55 742.55 742.55 ZT12-15 636.25 636.25 636.25 ZT16-19 665.5 665.5 665.5 ZT20-23 620.65 620.65 620.65