condition mean min max ZT0-3 10.25 10.25 10.25 ZT4-7 2.2 2.2 2.2 ZT8-11 4.25 4.25 4.25 ZT12-15 18.549999999999997 18.549999999999997 18.549999999999997 ZT16-19 5.65 5.65 5.65 ZT20-23 26.35 26.35 26.35