condition mean min max ZT0-3 2.4 2.4 2.4 ZT4-7 4.1 4.1 4.1 ZT8-11 1.65 1.65 1.65 ZT12-15 3.25 3.25 3.25 ZT16-19 3.2 3.2 3.2 ZT20-23 9.549999999999999 9.549999999999999 9.549999999999999