condition mean min max ZT0-3 4.6813 4.6813 4.6813 ZT4-7 6.700125 6.700125 6.700125 ZT8-11 6.992485 6.992485 6.992485 ZT12-15 4.881665 4.881665 4.881665 ZT16-19 4.12648 4.12648 4.12648 ZT20-23 3.4471800000000004 3.4471800000000004 3.4471800000000004