condition mean min max ZT0-3 12.045449999999999 12.045449999999999 12.045449999999999 ZT4-7 9.521564999999999 9.521564999999999 9.521564999999999 ZT8-11 14.1898 14.1898 14.1898 ZT12-15 15.5796 15.5796 15.5796 ZT16-19 18.34545 18.34545 18.34545 ZT20-23 13.91685 13.91685 13.91685