condition mean min max ZT0-3 4.55 4.55 4.55 ZT4-7 0.6 0.6 0.6 ZT8-11 1.55 1.55 1.55 ZT12-15 9.649999999999999 9.649999999999999 9.649999999999999 ZT16-19 3.25 3.25 3.25 ZT20-23 1.4 1.4 1.4