condition mean min max ZT0-3 345.116216 345.116216 345.116216 ZT4-7 430.39883050000003 430.39883050000003 430.39883050000003 ZT8-11 436.0132335 436.0132335 436.0132335 ZT12-15 397.7467615 397.7467615 397.7467615 ZT16-19 449.5356585 449.5356585 449.5356585 ZT20-23 466.37410550000004 466.37410550000004 466.37410550000004