condition mean min max ZT0-3 4.51816 4.51816 4.51816 ZT4-7 3.195355 3.195355 3.195355 ZT8-11 2.556355 2.556355 2.556355 ZT12-15 3.19704 3.19704 3.19704 ZT16-19 5.5308600000000006 5.5308600000000006 5.5308600000000006 ZT20-23 5.77452 5.77452 5.77452