condition mean min max ZT0-3 6.342642499999999 5.428934999999999 7.256349999999999 ZT4-7 4.419595 4.419595 4.419595 ZT8-11 2.635605 2.635605 2.635605 ZT12-15 0 0 0 ZT16-19 5.381465 5.381465 5.381465 ZT20-23 7.3456 7.3456 7.3456