condition mean min max ZT0-3 4.45 4.45 4.45 ZT4-7 3.9 3.9 3.9 ZT8-11 17.45 17.45 17.45 ZT12-15 3.9 3.9 3.9 ZT16-19 27.55 27.55 27.55 ZT20-23 5.75 5.75 5.75