condition mean min max ZT0-3 6097.4 6097.4 6097.4 ZT4-7 4460.9 4460.9 4460.9 ZT8-11 4029.8999999999996 4029.8999999999996 4029.8999999999996 ZT12-15 4314.85 4314.85 4314.85 ZT16-19 6024.4 6024.4 6024.4 ZT20-23 6789.25 6789.25 6789.25