condition mean min max ZT0-3 7.50629 7.36489 7.647690000000001 ZT4-7 9.94302 9.94302 9.94302 ZT8-11 10.692499999999999 10.692499999999999 10.692499999999999 ZT12-15 0 0 0 ZT16-19 10.565339999999999 10.565339999999999 10.565339999999999 ZT20-23 12.024149999999999 12.024149999999999 12.024149999999999