condition mean min max ZT0-3 9.252571 9.252571 9.252571 ZT4-7 10.234449999999999 10.234449999999999 10.234449999999999 ZT8-11 11.1622155 11.1622155 11.1622155 ZT12-15 9.460536000000001 9.460536000000001 9.460536000000001 ZT16-19 9.3120765 9.3120765 9.3120765 ZT20-23 9.9098515 9.9098515 9.9098515